Gap adjustment device and adjustment method for continuously variable valve lift mechanism

Abstract

The invention relates to a gap adjusting device of a continuous variable valve lift mechanism, and belongs to the technical field of engine components. The gap adjusting device comprises a laser rangefinding sensor, sensor probes, an adjusting bolt grouping pad and a latch; and the sensor probes include long and short probes, one end of the long probe can be cooperated with the laser range finding sensor, the other end of the long probe can be placed in a pedestal calibration hole of the measuring seat and cooperated with the measuring seat, one end of the short probe can be cooperated with the laser range finding sensor, and the other end of the short probe can be placed in a measuring and calibrating hole of the measuring seat, cooperated with the measuring seat and limited by the latch. The invention also discloses an adjusting method of the gap adjusting device of the continuous variable valve lift mechanism. Thus, gap adjustment of the continuous variable valve lift mechanism isrealized, and smooth embarkation, reliable operation and batch industrialization of the mechanism are made possible.

Description

technical field [0001] The invention relates to the technical field of engine components, in particular to a gap adjustment device and an adjustment method of a continuously variable valve lift mechanism. Background technique [0002] It is widely required in existing internal combustion engines that its valve trains have continuously adjustable intake valve closing time and duration. Therefore, many OEMs are equipped with variable valve timing and variable valve lift technologies at the same time to realize intake valve opening. Under the premise of constant time: the lift duration is synchronously increased, and the closing time is delayed; and the lift duration is synchronously decreased, and the closing time is advanced. [0003] In the actual use process, due to the large number of cam followers of the variable valve lift mechanism, large error accumulation will occur in the process of parts manufacturing and mechanism installation, and the accumulated errors in the mec...

AI Technical Summary

Problems solved by technology

[0005] Using the hydraulic mechanism alone to adjust the clearance, although the matching steps can be omitted, and a certain friction work gain can be obtained by rolling contact, but the overall stiffness of the system will be reduced, making it difficult to obtain an accurate valve lift curve

Moreover, under the condition of excessive oil pressure, the hydraulic clearance adjuster has no mechanical limit, which is prone to pump lift

[0006] Using the mechanical structure alone to adjust the gap can improve the adjustment accuracy, but the adjustment range is limited by the number of groups, which puts forward higher requirements for the setting of the part group and the machining accuracy of the parts

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