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Ball plunger for use in a hydraulic lash adjuster and method of making same

A gap adjuster and ball plunger technology, applied in the field of ball plungers, can solve the problems of increasing the cost and time consumption of finished ball plungers

Active Publication Date: 2010-03-31
EATON INTELLIGENT POWER LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the machining process is time consuming and adds to the cost of the finished ball plunger

Method used

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  • Ball plunger for use in a hydraulic lash adjuster and method of making same
  • Ball plunger for use in a hydraulic lash adjuster and method of making same
  • Ball plunger for use in a hydraulic lash adjuster and method of making same

Examples

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Embodiment Construction

[0016] The specific terms used in the above description for convenience are for reference only and not for limitation. The terms "upwardly", "downwardly", "upper" and "lower" are to be understood to have their standard meanings and refer to those directions when the drawings are normally viewed. All of the above terms mentioned above include normal derivatives and equivalents thereof.

[0017] This application relates to ball plungers for use in hydraulic lash adjusters. The ball plunger is a one-piece structure that is cold formed to a near net shape, requiring less machining to complete the finished part than prior art ball plungers.

[0018] Figure 1A A cross-sectional view of an exemplary hydraulic lash adjuster 100 is shown. The hydraulic lash adjuster 100 is a variation of a Type II valve train and is shown by way of example only, and it will be understood that the ball plunger employed therein may be used in any hydraulic lash adjuster configuration and is not limiti...

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Abstract

A cold-formed ball plunger blank is provided for use in manufacturing a finished ball plunger used in a hydraulic lash adjuster that includes a check valve assembly having a check ball and a retainer. The ball plunger blank includes a cup-shaped member that extends from a first end to a second end along a longitudinal axis. The cup-shaped member includes a ball portion adjacent the first end of the member and a body portion adjacent the second end of the member. The body portion has a cavity disposed therein, a counterbore extending from the second end of the body towards the first end of the member, and a shoulder that separates the cavity from the counterbore and at least partially closes the cavity. The shoulder defines a ball seat surface configured to receive the check ball and a retainer receiving surface configured to receive the retainer, wherein the ball seat surface and the retainer receiving surface are to sized to the final dimensions of the finished ball plunger. The invention also relates to a method of cold-formed ball plunger blank.

Description

technical field [0001] The present application relates to a ball plunger for use in a hydraulic lash adjuster and a method of manufacturing the same. Background technique [0002] Hydraulic lash adjusters (sometimes referred to as "tappets") for internal combustion engines have been used for many years to eliminate play (or "play") between parts of an engine's valvetrain under a variety of operating conditions in order to Maintain efficiency and reduce noise and wear in the valve train. Hydraulic lash adjusters operate on the principle of transferring energy to the valve actuation cams through hydraulic fluid collected in a pressure chamber under the plunger. In Type II valvetrains, the plunger is called a "ball plunger" because it has a spherical portion at one end and a seating surface at its other end. During each operation of the cam, when the length of the valve actuating parts changes due to temperature changes and wear, a small amount of hydraulic fluid is allowed t...

Claims

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Application Information

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IPC IPC(8): F01L1/24
CPCF01L1/2405Y10T29/49304Y10T29/49995Y10T29/49298Y10T29/493Y10T29/49311Y10T29/49313F01L1/14F01L2303/00B21C23/14B21C23/20F01L1/24
Inventor G·贾诺维亚克
Owner EATON INTELLIGENT POWER LIMITED
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