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hydraulic lash adjuster

A clearance adjuster, hydraulic technology, applied in valve details, machine/engine, engine components, etc., can solve problems such as very sensitive mechanical clearance

Active Publication Date: 2018-02-06
EATON SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Valve trains used in conjunction with engine braking systems are known to be very sensitive to mechanical play in the valve train and require regular maintenance by a skilled mechanic

Method used

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Examples

Experimental program
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Embodiment Construction

[0020] figure 1 A valvetrain assembly 1 embodying the invention is shown, comprising a rocker arm 3, a valve bridge 5 engaging a pair of exhaust valves 7 for a cylinder 9 of an engine (not shown), a pushrod 11. HLA 13 and camshaft 15. The rocker arm 3 is mounted pivotably about a rocker shaft 17 . The first end 19 of the rocker arm 3 comprises a first ball head 21 connected to a central socket 23 of the valve bridge 5 and the second end 25 of the rocker arm 3 comprises a first ball joint 21 connected to an end socket 29 of the pushrod 11. Two ball heads 27. The putter 11 includes at its other end a third head 31 connected to the HLA 13 .

[0021] Camshaft 15 includes an exhaust cam 33 having a base circle 35 and a lift (ie, cam lobe) 37 . During engine operation, as camshaft 15 rotates (as indicated by arrows), lift profile 37 begins to engage HLA 13 and the engine enters the exhaust stroke of the engine cycle. The lift profile 37 pushes the HLA 13 upward, thereby pushing...

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PUM

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Abstract

A hydraulic lash adjuster is provided with a pressure relief valve operable to release oil from the lash adjuster's oil chamber to enable the hydraulic lash adjuster to be able to retract when required.

Description

technical field [0001] The present invention relates to hydraulic lash adjusters. Background technique [0002] A typical hydraulic lash adjuster (HLA) includes an oil chamber defined between an outer body and a plunger mechanism slidably mounted within the outer body, and a spring arranged to move the plunger mechanism outwardly from the outer body. This lumen is enlarged to allow the HLA to elongate. Oil flows into the cavity through the check valve, but can only escape the cavity slowly, such as through closely spaced drain surfaces. Thus, the HLA can be stretched to eliminate any gaps in the valve train assembly, such as the gap between the cam and the roller, but after stretching, the incompressible oil in this cavity provides a strong enough support for the HLA to open the valve as the rocker arm pivots (ie, the incompressible oil prevents the plunger mechanism from being pushed back into the outer body, making the HLA a single piece). Typically, the HLA has a secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L13/06F01L1/24F01L1/25F01L1/08F01L1/18F01L1/26
CPCF01L1/08F01L1/181F01L1/2422F01L1/252F01L1/26F01L13/06F01L2001/2427
Inventor M·赛瑟
Owner EATON SRL