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Push bar for switchable valve train of reciprocating piston internal combustion engine

A valve train, push bar technology, applied in the directions of machines/engines, mechanical equipment, engine components, etc., can solve the problems of the spring tongue that cannot support the swing force, the deflection of the spring tongue, the weakening of the spring tongue, etc.

Pending Publication Date: 2021-08-03
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this single-point fastening cannot support the pivoting force acting on the spring tongue, so that the spring tongue may be deflected inside the through-opening
There is also the risk that the spring tongue will be weakened at its fastening point due to the increased radial stress in the round hole

Method used

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  • Push bar for switchable valve train of reciprocating piston internal combustion engine
  • Push bar for switchable valve train of reciprocating piston internal combustion engine
  • Push bar for switchable valve train of reciprocating piston internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] exist Figures 1 to 4 , the spring tongue marked with 1 is shown in detail, which is fastened to the push bar 2 . The push strip 2 (not shown) is mounted parallel to the camshaft of the internal combustion engine and is designed to be displaceable against spring force by means of a linear actuator.

[0019] The spring tongue 1 has a butt strap 3 which is arranged bent over at the upper end of the spring tongue 1 . Adjacent to the bend of the spring tongue 1 , an elongated hole 4 is formed in the butt strap 3 , which is oriented transversely to the butt strap. The spring tongue 1 is arranged aligned on the push bar 2 and is then connected to the push bar 2 via spot welds 5 . Subsequently, the material 9 of the push strip 2 is pressed into the elongated hole 4 by means of punching and self-clinching by means of a tool arranged below the push strip 2 .

[0020] Such as image 3 As shown, the material displacement is carried out, for example by means of a corresponding ...

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Abstract

The invention relates to a push bar (2) for a switchable valve train of a reciprocating piston internal combustion engine. And a spring tongue (1) serving as a plate spring suspension is fastened on the push bar. The upper end (3) of the respective spring tongue is used as a bent butt strap. The butt strap is fastened to the push bar via two fastening points (10, 11). The lower end (7) of the respective spring tongue is provided for resting on the outer end wall of the switching pin protruding from the side wall of the switchable rocker arm. The butt strap is transversely located on the push bar, and the two fastening points of the butt strap are transversely distributed in succession relative to the push bar. In order to present an inner fastening point (10) facing the spring tongue, the butt strap has elongated holes (4) distributed parallel to the push bar. The material (9) of the push bar is introduced into the elongated hole by means of punching self-riveting. The outer fastening point (11) facing the edge (8) of the butt strap is a weld (5).

Description

technical field [0001] The invention relates to a push bar for a switchable valve train of a reciprocating piston internal combustion engine, which can be moved by means of a linear actuator against the restoring force of a spring element, on which push bar is fastened as a leaf spring Suspended spring tongues, wherein the upper end of the respective spring tongue is present as a bent butt strap, which is fastened to the push bar via two fastening points, and wherein the lower end of the respective spring tongue It is arranged to bear against the outer end wall of the switching pin protruding from the side wall of the switchable rocker. Background technique [0002] by DE 10 2018 111 185 A1 figure 2 A push strip of this type for a switchable valve train is known. It can be seen that the butt straps of the push rod, which are bent out of the respective spring tongue at the end, are guided through the transverse slot of the push rod, extend along this push rod and are connec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/18
CPCF01L1/18
Inventor 斯文·劳特纳托马斯·梅耶理查德·拜尔拉尔夫·克雷斯
Owner SCHAEFFLER TECH AG & CO KG
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