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CN-114251149-B - Intermediate lever for a variable lift valve train of an internal combustion engine

CN114251149BCN 114251149 BCN114251149 BCN 114251149BCN-114251149-B

Abstract

An intermediate lever for a variable-lift valve train of an internal combustion engine is proposed, the upper part of which has a pivot bearing and the longitudinal middle section of which carries a rolling mechanism, which on the underside transitions into a base which widens the intermediate lever at least on one side in the direction of its pivoting with a base projection and on the underside of which there is a slotted track for contact with a valve opener, wherein the intermediate lever has a contact portion for a leg of a cam return spring at the base projection, wherein the intermediate lever is present in the upper part and the longitudinal middle section as a continuously flat, one-piece plate, wherein the pivot bearing is a bearing hole in the upper part, wherein two disks are provided as rolling mechanisms in the longitudinal middle section, which each extend on a common axis extending through the longitudinal middle section at the outer wall thereof, and wherein the base is joined below the disks in one piece to a transverse thickening of the longitudinal middle section.

Inventors

  • Katja Hoffler
  • Joseph browndell
  • KREIS MICHAEL DR.
  • Michael Kugeler

Assignees

  • 舍弗勒技术股份两合公司

Dates

Publication Date
20260508
Application Date
20210907
Priority Date
20200925

Claims (6)

  1. 1. An intermediate lever (1) for a variable-lift valve train of an internal combustion engine, the upper part (2) of which has a pivot bearing (3) for rotationally movable arrangement on a carrier (4) of the internal combustion engine and the longitudinal middle section (5) of which carries a rolling mechanism (6) for at least indirect counter-movement of a lifting cam, the longitudinal middle section (5) transitioning on the underside into a seat (7), the seat (7) widening the intermediate lever (1) in its pivoting direction by a seat projection (8) at least on one side and on the underside (9) of the seat a slotted track (10) for contact with a valve opener, and wherein the intermediate lever (1) has an abutment (11) for a leg of a cam return spring at the seat projection (8), It is characterized in that the method comprises the steps of, The intermediate lever (1) is present in the upper part (2) and the longitudinal middle section (5) as a continuous flat, one-piece plate, wherein the pivot bearing (3) is a bearing hole in the upper part (2), wherein two disks are provided in the longitudinal middle section (5) as rolling means (6), which disks each extend on a common shaft (13) extending through them at an outer wall (12) of the longitudinal middle section (5), and wherein the base (7) is joined below the disks (6) in one piece to a transverse thickening (14) of the longitudinal middle section (5).
  2. 2. The intermediate lever according to claim 1, It is characterized in that the method comprises the steps of, The base projection (8) of the base (7) has a fork-shaped opening (4) which engages in one piece on its end face (15) as an abutment (11) for a leg of the cam return spring.
  3. 3. The intermediate lever according to claim 1, It is characterized in that the method comprises the steps of, The upper part (2), the longitudinal middle section (5) and the base (7) of the intermediate lever (1) are made of steel plates.
  4. 4. An intermediate lever according to claim 1 or 3, It is characterized in that the method comprises the steps of, The transverse thickening of the base (7) is realized by a punching extrusion process or by forging.
  5. 5. The intermediate lever according to claim 1, It is characterized in that the method comprises the steps of, The upper part (2), the longitudinal middle section (5) and the base (7) of the intermediate lever (1) are formed by extrusion.
  6. 6. The intermediate lever according to claim 1, It is characterized in that the method comprises the steps of, The upper part (2) and the longitudinal middle section (5) are present as continuous straight fingers which are placed at an angle of 45 ° to 90 ° with respect to the base (7).

Description

Intermediate lever for a variable lift valve train of an internal combustion engine Technical Field The invention relates to a middle lever for a variable-lift valve train of an internal combustion engine, the upper part of which has a pivot bearing for rotationally movable arrangement on a carrier of the internal combustion engine and the longitudinal middle section of which carries a rolling mechanism for at least indirect counter-movement of a lifting cam, which longitudinal middle section transitions on the underside into a base which widens the middle lever, viewed in the direction of its rotation, at least on one side by a base projection and on the underside of the base has a slotted track for contact with a valve opener, and wherein the middle lever has an abutment for a leg of a cam return spring on the base projection. Background Such intermediate bars are known from DE 10 2018 132 561A1. The upper part and the longitudinal middle section thereof are formed by two spaced apart side walls which accommodate between them a rolling mechanism for the counter-movement of a "suspended (fliegenden)" roller which is acted upon by the lifting cam and simultaneously by the cam disk upon installation. In the upper part, the side walls have in each case one hole for supporting on a carrier of the internal combustion engine. Furthermore, the side walls are connected in a section of the upper part by a transverse bow. Disclosure of Invention The object is to create an intermediate lever which is of very simple design and which can also be used in the case of a narrow installation space. According to the invention, the intermediate lever is present in the upper part and the longitudinal middle section as a continuous flat, one-piece plate, wherein the pivot bearing is a bearing hole in the upper part, wherein two disks are provided in the longitudinal middle section as rolling means, which disks each extend on a common axis extending through them at the outer wall of the longitudinal middle section, and wherein the base is joined in one piece to the transverse thickening of the longitudinal middle section below the disks. There is therefore a very simple "staggered" intermediate lever which can be produced in a cost-effective manner and which requires relatively little installation space laterally, also in the region of the two disks. Preferably, though not exclusively, the intermediate bar should be stamped from sheet metal strips. The thickened bottom is extruded by a punching extrusion processAnd (3) generating. Upsetting, forging or extrusion are also contemplated herein. The support hole for pivotally movably suspending the intermediate lever on the carrier of the cylinder head of the internal combustion engine has the width of the metal plate. If necessary, it can also be provided in a bulge-like manner or a separate sleeve can be used. At the same time, the bearing opening can be closed, open as an opening or also "hook-shaped". Alternatively, the entire intermediate lever body can also be produced in the MIM method or by punching extrusion or the like. It may be sufficient to provide only one disk in total as a rolling mechanism. The runner track in the base can likewise be punched. However, the production of the cutting thereof is also conceivable. According to a further development of the invention, the end face of the base projection has a fork-shaped opening. The opening is formed in one piece into the base projection and serves for abutment and guiding of the leg of the cam return spring. The opening can extend vertically or laterally, depending on the direction of action of the spring leg. Although the upper portion can extend substantially orthogonal to the chassis along with the longitudinal middle section. However, it has proven to be appropriate here to enclose an angle of 45 ° to 90 °, so that the functional parts do not collide with one another. As a valve opener loaded by the intermediate lever, a tow lever or a rocker arm is first considered. Alternatively, however, rockers or lifters are also conceivable. Drawings Regarding the drawings: FIG. 1 shows a first perspective view of an intermediate lever completed installation, and Fig. 2 shows a view from the front of this rotation. Detailed Description From the two figures, the intermediate lever 1 results, which in the section of its upper part 2 and in the longitudinal intermediate section 5 is present as a continuous flat, one-piece plate and the base 7 joined integrally, i.e. together with it, is formed from a steel plate. The longitudinal middle section 5 thus extends directly onto the foundation 7. The intermediate lever 1 has a pivot bearing 3 in the form of a bore at its upper part 2 for rotatably movable arrangement on a carrier 4 of the internal combustion engine. In the lower section of its longitudinal middle section 5, at each outer wall 12, the disk 6 extends on a continuous shaft 13. The support means is provided here with a sli