DE3219175A1 - METHOD FOR PRODUCING A MACHINE ELEMENT FROM SHEET, IN PARTICULAR A VALVE ACTUATING LEVER FOR COMBUSTION ENGINES, AND VALVE ACTUATING LEVER PRODUCED BY THE METHOD - Google Patents

Description

III I «With

Method for producing a machine element from sheet metal, in particular a valve actuating lever for Internal combustion engines, and manufactured by the method Valve operating lever

The invention relates to a method for producing a machine element from sheet metal of the type according to The preamble of claim 1 and a valve actuation lever of the type according to the preamble of claim U.

The bearing surface is interrupted by the gap in known machine elements of this type (DE-OS 28 19 356). This results in insufficient lubrication and high wear, because the lubricant · by the relative wide gap flows away to a considerable extent and thus the lubricating film is broken down.

The invention is based on the object of a method for producing a machine element from sheet metal of the type to create according to the preamble of claim 1, with which a bearing surface with less interruption and a less loss of lubricant is achieved through a narrower gap.

According to the invention, this object is achieved by the characterizing features of claim 1. Further training of the Invention are characterized in claims 2 and 3. Claim 4 includes a valve operating lever which is made by the method of the invention.

Il I I I I

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In the drawing, a valve operating lever for internal combustion engines is shown, according to the invention
Process is established. It shows:

Fig. 1a

and FIG. 1b shows a plan view and a side view of a

Valve operating lever made of sheet metal,

Fig. 2 shows, in an enlarged view, the partially

cut bearing-side end of the valve actuator-)

transmission lever according to Fig. 1b and '■]

3 shows a section along the line III-III to P.

Fig. 2. (;

ί

A valve operating lever 1 made of a - viewed from above - > \

hen - U-shaped bent sheet metal strip has two in %

essentially in one parallel to its oscillation plane; '■)

Level arranged legs 2 on. At a distance from the bridge 3 f,

the legs 2 are locally pressed together and with a μ

Weld point 4 connected to one another. When squeezing 'i'

are the legs 2 together with the web 3 so ver ;; <

forms that it forms a spherical jib-like bearing point 5 with l \

Form spherical ring zones-shaped bearing surface 5 '. ';; ·

· 'Fj

The two | extend in the area of the storage area 5 '

Legs 2 first towards each other and then each after |; a substantially right-angled bend 6 initially

lying flat against one another radially from the bearing surface 5 'i;

path. A gap 7 is formed between the legs 2, 1

which extends from the storage area 5 'to the ■■■

Welding point 4 determined the point of contact 4 ″ of the legs |

2 narrows according to the dashed contour 8. Yes

To improve the storage of the valve operating lever f

1 the gap 7 is narrowed in the following way: At the |

Bends 6 is from the outside by cold or hot-Verformeri ύ

by means of embossments 6 'of material towards the bearing surface 5 ¹ |

ί | 1 pressed. This creates on both sides of the gap 7 each

I have a bead 8 'parallel to this. These beads 8 '

I are made using a counter tool or subsequent cold

i | calibrate towards gap 7 pressed and smoothed. Of the

<| 5 gap; 7 is narrowed so significantly that the bearing

% area 5 'is almost uninterrupted in this area.

I The lubrication of the bearing point 5 is done in this way

■ '■ improved because less lubricant through the gap

■; can drain. The bearing surface 5 'is also reduced as a result larger and largely closed.

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Claims (3)

• · I I I · I I I 1 III Patent claims: 11.j method of manufacturing a bearing point on machines ^ "^ nenelementen from sheet metal, in particular of valve actuating levers for internal combustion engines, - with a cylindrical and / or spherical bearing surface, - which is formed from two sheet metal sections adjoining each other with a radial gap, - The gap starting from the bearing surface narrowed to the point of contact of the sheet metal sections, characterized in that - That by pressing and / or melting deformation of the sheet metal sections (Schenksl 2) material in such a way to the bearing surface (5) is shifted towards - That the gap (7) on the bearing surface (5 ^f ) is narrowed, and - that the bearing surface (5 ') with a shape corresponding tool part limited hours ^1: is. 30th 2. The method according to claim 1,
characterized, - That in two successive process steps first a bead on both sides of the gap (7) (80 is produced and then the beads (8 ') in such a way from here
the bearing ^{surface (5 f} ) are deformed, - That the gap (7) narrows and the bearing surface (5 ') receives its shape in the area of the gap (7). • t · t · t · ti I t t I . , I 111 ■ · II · · ■ ·· ■! 3. The method according to claim 1 or 2> characterized in that the bearing surface (5 ¹ ) is calibrated by means of the tool part at the same time. i \. Valve actuation lever made of sheet metal, in particular for internal combustion engines, - with a bearing point having a spherical bearing surface at one end of the lever, - The one from one end web and the two parallel to the lever swing plane lying legs of a one-piece U-shaped sheet metal part is formed, - with the legs at a distance from the web with a Gaps approach each other and are connected to each other at a point of contact, characterized, - That the gap (7) ^{is narrowed in the area of the bearing surface (5 1} ) by means of pressed and / or melt-displaced sheet metal parts.