DE102011003212A1 - Modular-composite crossbeam-free rocker arm for valve train of internal combustion engine of motorcycle, has side wall whose end is fixed with crossbeam at forehead which lies on connection bracket - Google Patents

Abstract

The arm (1) has two individual upright side walls (2) made of thin walled lightweight construction material. The side wall includes holes (4) in a middle-near portion (3), over which a separate tube piece (5) is held on each side wall. A bearing of the arm is placed on a rocker shaft. The tube pieces are spaced from each other. An end (6) of the side wall is fixed with a crossbeam (7) at a final forehead (8) which lies on a connection bracket (9). Another end (10) of the side wall is bridged with an axis (11) of a cam approach roller.

Description

The invention relates to a rocker arm of a valve train of an internal combustion engine, with two substantially upright side walls of thin-walled lightweight material, which have bores at a mid-section, over which the side walls on a storage of the rocker arm on a rocker shaft serving pipe section, laterally spaced, and run wherein the side walls are bridged at a further end of an axis with a Nockenanlaufrolle.

Such a rocker arm is in the 4 . 5 of the DE 10 2005 046 897 A1 disclosed. Its side walls are connected by a bottom crossbar. Each side wall has a one-piece tailed pipe section for storage on a rocker shaft. At one end of the lever, a dome-shaped projection for receiving a valve clearance adjusting screw is made in one piece from the crossbar.

A production of the aforementioned rocker arm in mass production is still too expensive dar. U. a. is an expression of the one-piece tailed pipe sections and the dome-like approach consuming. In addition, the rocker arm due to its almost continuous crossbar has too large a mass, which enters negative in the moment of inertia.

It is an object of the invention to improve a rocker arm of the type mentioned in such a way that it is particularly inexpensive manufacturable in large series.

According to the invention, this object is achieved in that the rocker arm is composed in a modular manner and free of crossbars and has two individual side walls which extend over their holes on a separate piece of pipe and are held over it and wherein the side walls at one end via a U-like, with its crossbar are additionally fixed to a terminal end of the rocker arm connection bracket.

Thus, there is a lightweight rocker arm that can be displayed at very low cost, which is suitable, for example, for application in a motorcycle valve drive or a small-motion motor. Due to the proposed modular design valve trains of different engine types can be operated from a kit. The side walls of the rocker arm are held substantially by the pipe section and the connection clip.

It is intended to produce the side walls of the rocker arm punching-bending or stamping-embossing technology.

According to a particularly preferred claim, the separate side walls are fixed to the one, valve-side end via the U-shaped connecting bracket, which is itself prevented by a projecting from one of its legs nose at a longitudinal displacement.

In concretization of the invention, it is provided to represent a dome-like approach with an internal thread in the bore in the lower leg of the punching-bending technology preferably made of thin-walled steel sheet. Thus, the connection bracket serves as a multifunctional component and in addition to its holding function still has the task of receiving a Spieleinstellschraube and a bearing whose lock nut on a flat top of the upper leg.

According to a further advantageous embodiment of the invention, the side walls are located on two annular collars of the pipe section axially inwards, wherein the holder is accomplished axially outward, for example. About a bead or caulking an end face portion of the pipe section. The annular collars may alternatively be present as separate components.

In addition, it is expedient and provided to equip the side walls or at least one of them in the direction of the further to one end with a retracted course. Thus, the rocker arm takes in this area only a little lateral space. Possibly. Mass is saved.

The invention will be explained with reference to the drawing. Show it:

1 a spatial view of a fully assembled rocker arm;

2 the side walls of the rocker arm with canted ends and

3 an enlarged view of the connection bracket.

Is shown in 1 a modular composite rocker arm 1 for a valve train of an internal combustion engine. The rocker arm 1 has two single, bar-like side walls 2 made of sheet steel. The side walls 2 are manufactured punching and bending technology.

At a mid-section 3 have the side walls 2 drilling 4 , About this they are on a separate piece of pipe 5 held. The pipe piece 5 runs when installed on a rocker arm, not shown. It has two radially projecting annular collars 23 , At the axial outer surfaces 24 lie the side walls 2 at. A fixation of the side walls 2 axially outward via beadings 25 from frontal areas 26 of the pipe section 5 ,

At one end 6 are the side walls 2 over a U-like, with her crossbeam 7 on an end-face 8th of the rocker arm 1 lying connection bracket 9 additionally fixed (sa 3 ). The connection bracket 9 has a top and a bottom leg 12 . 13 , The upper leg 12 is over a top 18 the side walls 2 pushed. The lower thigh 13 runs with its outer sides 17 (S. 3 , Area above the dash-and-dash line) on inner surfaces 16 the side walls 2 ,

It can be seen that tails 29 the side walls 2 at one end 6 to form the end-face 8th are cranked towards each other. They are almost orthogonal to the remaining sidewall area. From the lower thigh 13 the connection bracket 9 stands in one piece a nose 14 in the lever interior direction away. This is how 3 shows, cut out of the lower sidewall area. The nose 14 runs on an inside 15 the tails 11 , Thus, the tails sit 29 between the crossbeam 7 and the nose 14 the connection bracket 9 ,

From the lower leg 13 the connection bracket 9 a dome-like approach sticks out in one piece 20 in the lever interior direction. This approach 20 is a hole 21 immanent with a thread for a valve clearance adjustment screw. The latter is through another hole 22 in the upper leg 12 the connection bracket 9 feasible.

The side walls 2 exist in the area between the pipe section 5 and the one end 6 from one another to running intermediate pieces 27 , At this close substantially straight end portions 28 towards the one end 6 towards. Thus, the rocker arm builds 1 at one end 6 narrow.

In the area of the other end 10 are the side walls 2 from an axis 11 bridged with a cam roller, not shown.

LIST OF REFERENCE NUMBERS

1

rocker arm

2

Side wall

3

middle section

4

drilling

5

pipe section

6

an end

7

crossbeam

8th

Endstirn

9

brace

10

another end

11

axis

12

upper leg

13

lower thigh

14

nose

15

inside

16

palm

17

outer surface

18

top

19

bottom

20

approach

21

drilling

22

further drilling

23

collar

24

outer surface

25

beading

26

Front side area

27

connecting piece

28

end

29

tail

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 102005046897 A1 [0002]

Claims (9)

Modular composite, crossbeam-free rocker arm ( 1 ) of a valvetrain of an internal combustion engine, with two individual, substantially upright sidewalls ( 2 ) made of thin-walled lightweight material, which is located at a mid-section ( 3 ) Drilling ( 4 ) over which the side walls ( 2 ) on one of a bearing of the rocker arm ( 1 ) on a rocker shaft serving separate pipe section ( 5 ), laterally spaced from each other, are held, wherein the side walls ( 2 ) at one end ( 6 ) via a U-like, with its crossbeam ( 7 ) on an end-face ( 8th ) of the rocker arm ( 1 ) lying connection bracket ( 9 ) are additionally fixed and wherein the side walls ( 2 ) at another end ( 10 ) from one axis ( 11 ) are bridged with a cam roller. Rocker arm according to claim 1, wherein end pieces ( 29 ) of the side walls ( 2 ) at one end ( 6 ) to form the end-face ( 8th ) are cranked towards each other, wherein at least one of the by the crossbar ( 7 ) connected legs ( 12 . 13 ) the connection bracket ( 9 ) a nose ( 14 ) protrudes orthogonally in the lever interior direction, which nose ( 14 ) on an inside ( 15 ) of the end pieces ( 11 ), so that the end pieces ( 29 ) between the crossbeam ( 7 ) and the nose ( 14 ) the connection bracket ( 9 ) to sit. Rocker arm according to claim 1 or 2, wherein inner surfaces ( 16 ) of the side walls ( 2 ) directly on external surfaces ( 17 ) of one of the through the crossbar ( 7 ) connected legs ( 12 O. 13 ) the connection bracket ( 9 ), wherein the further leg ( 13 O. 12 ) the connection bracket ( 9 ) on a respective upper or lower side ( 18 . 19 ) of the side walls ( 2 ) runs. Rocker arm according to claim 1, wherein a lower leg ( 13 ) the connection bracket ( 9 ) one-piece a dome-like approach ( 20 ) in the internal direction of the lever, which approach ( 20 ) a hole ( 21 ) with a thread for a valve clearance adjusting screw is immanent, which valve clearance adjustment screw through a further bore ( 22 ) in an upper leg ( 12 ) the connection bracket ( 9 ) is feasible. Rocker arm according to claim 1 or 2, wherein the connecting bracket ( 9 ) is present as a thin-walled, punch-bent technical sheet metal part, wherein, in the case of a back cover according to claim 2, the nose ( 14 ) as an inwardly bent material cutout from the leg ( 12 O. 13 ) is present. Rocker arm according to claim 1, wherein the pipe section ( 5 ) two radially outwardly projecting annular collars ( 23 ), at the axial outer surfaces ( 24 ) the side walls ( 2 ) issue. Rocker arm according to claim 6, wherein the side walls ( 2 ) on the pipe section ( 5 ) axially outwardly either via a flanging ( 25 ) or caulking or welding in the face area ( 26 ) of the pipe section ( 5 ) or via a snap-groove connection are fixed on this. Rocker arm according to claim 1, wherein the side walls ( 2 ) in the area between the pipe section ( 5 ) and the one end ( 6 ) of successive intermediate pieces ( 27 ), to which essentially straight end sections ( 28 ) towards the one end ( 6 ). Rocker arm according to claim 1, wherein the side walls ( 2 ) punch-bending technology of sheet steel are shown.

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