DE102014223602A1 - Switchable drag lever - Google Patents

Abstract

Proposed is a switchable drag lever (1) for a valve gear of an internal combustion engine, with an outer lever (2), between the arms (3) an inner lever (4) is added, which rocker arm (1) on a bottom (5) at one end ( 6) has a system (7) for a gas exchange valve and at another end (8) a pivot bearing surface (9), wherein the levers (2, 4) on a common axis (10) extend and in a coupling means arranged by these ( 11) are connectable to each other, wherein between arms (12) of the inner lever (4) a Nockenanlaufrolle (13) sits, which is mounted on a in these arms (12) received bolt (14), wherein the levers (2, 4) a cam return spring (15) for the inner lever (4) are braced with each other, wherein between the levers (2, 4) a Rückschwenkanschlag (23) for the inner against the outer lever (4, 2) is present, wherein at installation of the lever (2 , 4) their connection via the coupling agent ( 11), wherein the bolt (14) with stumps (16) laterally projects beyond the arms (3) of the inner lever (4), which stumps (16) of sections (17) which project in the direction of a longitudinal center plane of the finger lever (1) Arms (3) of the outer lever (4) are bridged and wherein upon contact of the stumps (16) on lower surfaces (18) of the sections (17) of the Rückschwenkanschlag (23) is present such that the coupling means (11) with play to its driver surface ( 19) in the other of the lever (4 or 2), wherein a defined coupling play by bolts (14) with diameter grouped held stumps (16) is set.

Description

The invention relates to a switchable rocker arm for a valve train of an internal combustion engine, with an outer lever, between the arms of an inner lever is relatively pivotally received thereto, which rocker arm on a bottom at one end a system for a gas exchange valve and at another end has a pivot bearing surface, said the levers extend on a common axis and are selectively connectable to one another in a coupling means arranged therebetween, wherein between the arms of the inner lever a Nockenanlaufrolle sits, which is mounted on a received in these arms bolt, wherein the lever by a cam return spring for the inner lever with each other are clamped, wherein between the levers a Rückschwenkanschlag for the inner compared to the outer lever is present and wherein when the system is levered her connection is made possible via the coupling means.

A generic rocker arm goes out of the US 2013/0186358 A1 out. It can be seen in 2 in that portions of upper sides of the arms of the outer lever collar on both sides over upper sides of the arms of the inner lever. As a result, the inner lever undergoes a travel limit when decoupled in its return pivot mode.

Special measures for setting a coupling play, d. H. a defined, slight free travel, which the nockenbeaufschlagte inside when coupling with the outer lever to the contact with its driver surface (here extended from the outer lever coupling piston) travels are not recognizable. However, such a game is required to ensure a safe and wear-free extension of the respective coupling piston in its adjacent driver contour under all conditions. The coupling play should always be aimed at in internal combustion engines of the same type with very low tolerancing.

It is therefore an object of the invention to adjust the coupling play with simple means in a drag lever as mentioned above.

According to the invention, this object is achieved in that the bolt with stumps projects laterally beyond the arms of the inner lever, that the stumps are bridged by cantilevered in the direction of a longitudinal center plane of the finger lever portions of the arms of the outer lever, that is present at rest of the stumps on lower surfaces of the sections of Rückschwenkanschlag in such a way that the coupling means is play-related to its driver surface in the respective other of the levers, wherein a defined coupling play is set by means of bolts with stumps held in groups.

Thus, there is a simple Koppelspieleinstellmaßnahme, at the same time a Rückschwenkanschlag is shown. After a corresponding measurement of an actual game on the respective rocker arm, eg. With a dummy bolt, thus a "matching" bolt from an assortment of thickness grouped held bolt is paired, after the installation of the desired coupling play is present; this uniformly on internal combustion engines of the same type or at least for each individual internal combustion engine.

The scope of protection also includes drag levers whose lever parts are only laterally adjacent to each other and thus are not built into each other. Of course, the protection also refers to rocker arm.

According to a development of the invention, thickness-grouped bolts are to be kept in stock, which have completely the same diameter throughout. Alternatively, bolts can be applied with only stepped butt areas or it is proposed to realize the game setting by plugged sleeves / tubes, etc., which are provided with different outer diameters.

The respective bolt should not be axially fixed specifically in the inner lever according to an expedient concretization of the invention. He runs only with his forehead in front of the inside of the arms of the outer lever. This reduces the manufacturing costs.

The invention is apparent from the drawing.

1 shows a side view of a finger lever;

2 shows a longitudinal center section through the drag lever as mentioned above and

3 shows a cross section through the drag lever along the section line EE of 1 ,

Shown is a switchable drag lever 1 for a valve train of an internal combustion engine.

The rocker arm 1 consists of a box-shaped outer lever 2 between his arms 3 an inner lever 4 is taken relatively pivotable for this purpose. The outside lever 2 indicates that in 2 right end drawn 6 at a bottom 5 a plant 7 for a gas exchange valve on. Also at the bottom 5 but at another end 8th (drawn left), has the outside lever 2 a pivot bearing surface present as a dome 9 for a preferably hydraulic support element.

The levers 2 . 4 run at one end 7 on a common axis 10 , It can be seen in 2 in addition, that above the pivot bearing surface 9 in the outer lever 2 a coupling agent 11 sits (piston), which in this case in its extended state, also called coupling state, is shown. It sits under a complementary driver surface 19 one the other end 8th facing crossbar 22 of the inner lever 4 ,

Between arms 12 the also box-like inner lever 4 is a cam pickup roller 13 arranged (sa 3 ), which on one in the arms 12 "Flying" bolt stored 14 via a roller bearing 20 (here needle bearing) runs. A plain bearing is also conceivable. A trained as a torsion spring cam return spring 15 for the inner lever 4 tense the levers 2 . 4 in a known manner to each other and sitting at the other end 8th ,

Out 3 is removable, that the bolt 14 with stumps 16 the poor 3 of the inner lever 4 projected laterally. These are stumps 16 from in the direction of a longitudinal center plane of the finger lever 1 that is, inside, cantilevered sections 17 the poor 3 of the outer lever 4 bridged. Thus, the inner learns against the outer lever 4 . 2 a Rückschwenk stop 23 at lower surfaces 18 the sections 17 ,

The aforementioned Rückschwenkanschlag 23 is designed so that in this a coupling play (sa description introduction) is set. When investing the bolt 14 over his stumps 16 on the lower surfaces 18 the poor 3 of the outer lever 2 has the coupling agent 11 (Coupling mode) thus a small and defined "backlash" to its driving surface 19 on the inner lever 4 , This empty path, or as previously mentioned "backlash", is through in the area of the stumps 16 grouped by diameter (for example 20 graded) and appropriately paired bolts 14 set equal to follower levers for internal combustion engines of the same type.

LIST OF REFERENCE NUMBERS

1

 cam follower

2

 external lever

3

 Arm (outer lever)

4

 internal lever

5

 bottom

6

 an end

7

 investment

8th

 other end

9

 Swivel bearing surface

10

axis

11

coupling means

12

Arm (inner lever)

13

Cam nose role

14

bolt

15

Cam return spring

16

dull

17

section

18

undersurface

19

entraining

20

Rolling bearing (needle bearing)

21

forehead

22

crosspiece

23

Rear pivot stop

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

• US 2013/0186358 A1 [0002]

Claims (5)

Switchable drag lever ( 1 ) for a valve train of an internal combustion engine, with an external lever ( 2 ), between its arms ( 3 ) an inner lever ( 4 ) is received relatively pivotable thereto, which rocker arm ( 1 ) on a lower side ( 5 ) at one end ( 6 ) an annex ( 7 ) for a gas exchange valve and at another end ( 8th ) a pivot bearing surface ( 9 ), the levers ( 2 . 4 ) on a common axis ( 10 ) and via in a coupling means arranged by these ( 11 ) are selectively connectable, with between arms ( 12 ) of the inner lever ( 4 ) a cam roller ( 13 ) sitting on one in these arms ( 12 ) received bolts ( 14 ), the levers ( 2 . 4 ) by a cam return spring ( 15 ) for the inner lever ( 4 ) are clamped together, wherein between the levers ( 2 . 4 ) a Rückschwenkanschlag ( 23 ) for the inner against the outer lever ( 4 . 2 ) and when the lever ( 2 . 4 ) their connection via the coupling agent ( 11 ), characterized in that the bolt ( 14 ) with stumps ( 16 ) the poor ( 3 ) of the inner lever ( 4 ) laterally surmounted that the stumps ( 16 ) from in the direction of a longitudinal center plane of the finger lever ( 1 ) cantilevered sections ( 17 ) the poor ( 3 ) of the outer lever ( 4 ) are bridged that when stumps ( 16 ) on lower surfaces ( 18 ) of the sections ( 17 ) the back pivot stop ( 23 ), such that the coupling agent ( 11 ) play with its driving surface ( 19 ) in the other of the levers ( 4 or 2 ), whereby a defined coupling play by bolts ( 14 ) with stumps held in groups ( 16 ) is set. Cam follower according to claim 1, characterized in that bolts ( 14 ) are kept grouped with a completely continuous same diameter. Cam follower according to claim 1, characterized in that bolts ( 14 ), which have an equal diameter in the receiving area between the arms ( 12 ) the inner lever ( 4 ) and their diameter grouping only in the section of the stumps ( 16 ) is made. Drag lever according to claim 3, characterized in that the diameter grouping of the stumps ( 16 ) is realized by a variable thickness held and placed on these sleeves / tubes. Drag lever according to claim 1, characterized in that the bolt ( 14 ) "Flying" in the arms of the inner lever ( 4 ) sits.

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