WO2016019954A1

WO2016019954A1 - Finger follower

Info

Publication number: WO2016019954A1
Application number: PCT/DE2015/200342
Authority: WO
Inventors: Peter Sailer; Michael Schewe; Siegfried Tisch
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2014-08-07
Filing date: 2015-06-03
Publication date: 2016-02-11
Also published as: CN106574520B; CN106574520A; DE102014215701A1

Abstract

Disclosed is a finger follower (1) for a valve train in an internal combustion engine, comprising two sidewalls (3) that are connected by means of a cross-beam (2); at one end in front of the end face, the cross-beam (2) has a dome (6) for supporting the finger follower (1) on a supporting element; at the other end in front of the end face, the cross-beam (2) has a following-member abutment (9); and between the ends, the cross-beam (2) has a cam thrust surface (10). As an essential feature, partial inner segments of the dome (6) are formed directly by creating indentations (11) in inner surfaces (12) of the laterally extending sidewalls (3).

Description

cam follower

The invention relates to a rocker arm made of sheet metal, in particular for a valve or Einspzzpumpentheb an internal combustion engine, with two connected by a transverse balks side walls, the crossbeam at one end of a dome for supporting the rocker arm on a support element, in front of his cross-beam at its end another end has a follower link and between the ends of a Nockenanlauffläche.

A generic drag lever is disclosed in DE 10 2006 048 342 A1. This builds in the Kalottenbereich comparatively wide and has a cross-section in the dome an M-like profile (see Figure 5).

State-of-the-art, downsized internal combustion engines have comparatively little space in the cylinder head, so that there is a risk of collision with surrounding components in the case of wide-developed rocker arms. In addition, injectors for direct fuel injection, for example, must be accommodated. Also, the o. G. Drag lever due to its width at sliding cam valve drives only limited use. In this case, when switching to a small or O-cam lift, the deactivated cam could come into contact with the cam follower. In addition, it is found that the cited drag lever has too much mass.

It is an object of the invention to provide a drag lever of the type mentioned without the disadvantages listed. In particular, the drag lever should at least build narrow in the dome area, without changing the dome size.

According to the invention, this object is achieved in that partial inner segments of the calotte are formed directly by Materialeinformungen in inner surfaces of the laterally passing side walls. Thus, there is a drag lever without the aforementioned disadvantages. In simple terms, a portion of the dome is "relocated" into the adjacent side walls, so there is no material doubling in the cross section with the risk of cracking, thinning, etc. The comparatively low mass lever now builds narrow in the dome area and can be without In addition, it is excellently suited as a cam follower in a sliding cam valve drive The support element used hitherto does not have to be reduced in its head area.

As a sheet metal material for the preferably punch-bending technology manufactured drag lever is especially intended for thin-walled steel or aluminum. Possibly. Also other lightweight materials, including fiber or particle-reinforced, come into question. Alternatively, the lever can be made by forming or by machining.

Included with the scope is also a structural unit consisting of drag lever and support element, optionally also connected by a retaining clip at one end, or an assembly consisting of drag lever with only the retaining clip.

In particular, the drag lever (alternatively also rocker arm) in a valve or pump drive (eg, but not exclusively for fuel injection) to be used. However, it can also be used, for example, in compressors or other media conveyors.

According to a particularly preferred embodiment of the invention, the side walls, in the longitudinal section between the other end and the Nockenanlauffläche depend on the crossbar. Thus, it is clear that the drag lever has substantially an inverted U-profile and faces with its crossbar to the respective cam or eccentric. Furthermore, it is proposed that the rocker arm, viewed in the longitudinal direction of the other end to one end, behind the cam contact surface has an intermediate wall connecting its side walls, from the bottom of the crossbar with the hierein shaped dome runs largely flat to one end. Thus, ultimately, the U-profile reverses in this area.

According to a further embodiment, the drag lever is free of side walls at one end. This measure simplifies manufacturing and saves mass and material. Alternatively, the side walls or partial areas thereof can also start from one end.

According to another subclaim, the side walls, starting from one end to at least the intermediate wall, run straight-unexploded. Thus, another contribution has been made in the direction of simplifying the design and saving space. It is also envisaged to make the rocker arm in the longitudinal direction completely straight-unexhausted or at least to a section at or behind the Nockenanlauffläche (seen from one end) or only slightly bulge the longitudinal section at the cam contact surface.

Another subclaim relates to a simple way of displaying the Materialeinformungen in the side walls. After this, the indentations are to be produced, for example, by embossing, which can be done before the side walls are set up on the board. Possibly. can also be extruded or braced. Alternatively, the indentations can also be present as windows, so that the corresponding side wall sections are completely free of material.

To create a simple attachment of a retaining clip at one end of the crossbar at its two edge regions with abruptions o. The like. Be provided, so that a central material tongue remains on the crossbar. The invention is apparent from the drawing.

FIG. 1 shows a three-dimensional view obliquely from above onto a drag lever resting on a support element;

FIG. 2 shows a longitudinal section through the aforementioned drag lever;

• Figure 3 shows a cross section through the drag lever in support on the support element and

FIG. 4 shows a spatial bottom view of the drag lever in the dome area.

Shown in FIG. 1 is a narrow and lightweight drag lever 1 for a sliding cam valve drive of an internal combustion engine.

The drag lever 1 consisting of thin-walled sheet steel has two side walls 3 connected by a transverse bar 2. These hang in the longitudinal section between another end 8 and a cam contact surface 10 from the transverse bar 2, so that an inverted U-profile can be found in this area.

The crossbeam 2 has on its underside, in front of its cross-member 4 at one end 5, a cam-drawn dome 6, via which the drag lever 1 is mounted on a support element 22 (FIG. 1, 3). Before a transverse end 7 at the other end 8, also at the bottom, the transverse bar 2 has a follower system 9 (here valve stem system). In addition, it is shown (see Fig. 1, 2) that in a window 20 of the crossbar 2, approximately centrally between the ends 5, 8, a roller extends as a cam contact surface 10, the roller mounted on a seated in the side walls 3 bolts 21 is. As can also be seen from FIGS. 1, 2, the side walls 3, viewed in the longitudinal direction toward the one end 5, are connected behind the cam contact surface 10 by an intermediate wall 13. From a top 16 of the intermediate wall 13, the side walls 3 fall in this case like a wedge on the crossbar 2 from. In a section of the cam follower 1, they pass over into the transverse bar 2, which which lies between a dome center 18 and a dome end 17 at the one end 5 (see also the arrow in FIG. 1).

It can be seen from FIGS. 2, 4 that partial inner segments of the calotte 6 are formed directly by embossed material recesses 11 in inner surfaces 12 of the sidewalls 3 passing sideways. The latter take over this with an immediate leadership function of the rocker arm 1 when stored on the support element 22. Material duplications, etc., as in the St. d. Technology in this area are found and which would lead to an unnecessarily wide-building cam follower here, are not present.

As shown, runs from a bottom 14 of the intermediate wall 13 of the crossbar 2 with the hierein shaped cap 6 largely flat to one end 5. Thus, ultimately no side wall material is found at this end 5.

The drag lever 1 has, as well as Figure 1 also well disclosed, between its ends 5, 8 a largely straight course, d. H. its side walls 3, which are now narrow even in the longitudinal section at the dome 6, are only slightly bulged, with a completely straight course, as set out in the introduction, would be particularly advantageous.

For captive attachment of a drag lever 1 on the support member 22 pivotally fixing retaining clip (not shown), the transverse end 4 of the crossbar 2 at one end 5 on both sides of aborts 19. Thus, a mit- tiger section of the transverse end 4 of the crossbar 2 in the one end 5 tongue-like. List of reference numbers) Cam followers

) Crossbeams

) Side wall

) Crossstim

) one end

) Calotte

) Crossbeam

) other end

) Follower system

0) cam contact surface

1) material injection

2) inner surface

3) intermediate wall

4) bottom

5) Oberstirn

6) top

7) Kalottenende

8) Dome Center

9) break off

0) window

1) bolts

2) support element

Claims

claims

1 . Traction lever (1) made of sheet metal, in particular for a valve or injection pump drive of an internal combustion engine, with two side walls (3) connected by a transverse bar (2), the cross bar ) a dome (6) for supporting the finger lever (1) on a support element (22), in front of its transverse end (7) at another end (8) a follower link (9) and between the ends (5, 8) a cam contact surface ( 10), characterized in that partial inner segments of the dome (6) are formed directly by Materialeinformungen (1 1) in inner surfaces (12) of the laterally passing side walls (3).

2. rocker arm according to claim 1, characterized in that the side walls (3), in the longitudinal section between the other end (8) and the Nockenanlauffläche (10), from the crossbar (2) depend, and, in the longitudinal direction to one end (5) seen behind the Nockenanlauffläche (10) by an intermediate wall (13) are connected, from the underside (14) of the crossbar (2) with the hierein shaped dome (6) largely flat to one end (5) runs.

3. rocker arm according to claim 2, characterized in that the side walls (3) with their Oberstirnen (15) seen in the longitudinal direction to the one end (5) from a top side (16) of the intermediate wall (13) wedge-like manner on the crossbar ( 2) and pass in a portion of the cam follower (1) in the crossbar (2), which which lies between a dome center (18) and a Kalottenende (17) at the one end (5).

4. rocker arm according to claim 2 or 3, characterized in that the side walls (3) in the longitudinal section between the one end (5) and the intermediate wall (13) or between both ends (5, 8) are uneven-walled.

5. drag lever according to claim 1, characterized in that the material leinformungen (1 1) in the inner surfaces (12) of the side walls (3) are present as impressions.

6. drag lever according to claim 1, characterized in that the transverse end (4) of the crossbar (2) at one end (5) on both sides with Abbrüchen (19) for attaching a retaining clip or with a retaining clip thereto is provided.

7. rocker arm according to claim 1, characterized in that in a window (20) of the crossbar (2) has a roller as Nockenanlauffläche (10) which on a in the side walls (3) seated pin (21) is roller-mounted or sliding or that a sliding surface is applied as a cam contact surface.