Method for testing a valve train device

The method of testing valve drive devices by detecting force characteristics between the carrier shaft and cam element addresses the challenge of ensuring a prolonged service life by automating the evaluation of latching device quality, enhancing reliability and reducing test time.

DE102013012162B4Active Publication Date: 2025-07-31MERCEDES BENZ GROUP AG
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Patent Information

Application Number
DE102013012162
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2013-07-19
Publication Date
2025-07-31
Estimated Expiration
2033-07-19

AI Technical Summary

Technical Problem

Existing valve drive devices for internal combustion engines face challenges in ensuring a prolonged service life due to manufacturing errors and the need for efficient testing methods that can quickly assess the quality and reliability of latching devices.

Method used

A method for testing the valve drive device by detecting the force characteristic between the carrier shaft and cam element through axial displacement, allowing for a fully automated evaluation of manufacturing errors and latching device quality, using a testing device with a measuring system to determine displacement forces within a defined tolerance range.

Benefits of technology

Ensures a 100% test sharpness in a short time, increasing the reliability and operational reliability of the valve train device by identifying and excluding manufacturing errors, thereby enhancing the service life and reducing test time and production cycle.

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Abstract

Method for testing a valve train device with a support shaft (12) and at least one cam element (13, 13') mounted axially displaceably on the support shaft (12) for an internal combustion engine, in which a force characteristic curve (10) of a locking device (11) between the support shaft (12) and the cam element (13, 13') is detected by axially displacing the support shaft (12) and the cam element (13, 13') against each other and recording the force characteristic curve (10) of a displacement force over a displacement path, and determining an axial position of a force reversal (34) to evaluate the valve train device.
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Claims

[1] Method for testing a valve train device with a carrier shaft (12) and at least one cam element (13, 13') mounted axially displaceably on the carrier shaft (12) for an internal combustion engine, in which a force characteristic curve (10) of a locking device (11) between the carrier shaft (12) and the cam element (13, 13') is detected by axially displacing the carrier shaft (12) and the cam element (13, 13') against each other and recording the force characteristic curve (10) of a displacement force over a displacement path and determining an axial position of a force reversal (34) for evaluating the valve train device. [2] Method according to claim 1, characterized by that a tolerance range (15) of the displacement force is defined for the evaluation of the valve train device.

Citation Information

Patent Citations

  • Valve gear for four-cylinder row internal-combustion engine, has cam supports arranged in corresponding end positions for operating charge-cycle valve controlled by cam shaft, and axially moving between end positions on shaft

    DE102007016209A1

  • Valve train for e.g. inlet valves of cylinders of internal-combustion engine of rail-mounted vehicle, has locking device comprising two spring-tensioned latching balls that are arranged in borehole i.e. through-hole, of base camshaft

    DE102009005731A1

  • Valve drive for e.g. inlet valve of cylinder of internal-combustion engine, has cam shaft and cam carrier comprising cooperating units that are provided for pressing of tooth flanks of external and internal teeth displacement position

    DE102009048621A1

  • Valve train device

    DE102011116653A1

  • System for testing phase angle deviation of camshaft

    DE19858722A1