Switchable Valve Lifter Having a Mis-Assembly Indicator

Inactive Publication Date: 2010-11-04
DELPHI TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Briefly described, an improved SHVL in accordance with the present invention includes an improved arrangement for locking a spring tower into a pin housing. The spring tower is provided with an annular OD groove as in the prior art. However, the pin housing ID groove is modified to provide a two-step groove comprising two adjacent regions having different depths (different diameters) and having a distinct transition lip therebetween. An expansion clip

Problems solved by technology

The prior art assembly just described is especially vulnerable to failure from spring clips which are oversize.
If the ID of the clip is too large by as little as 0.15 mm, the clip may not fully lock into the tower groove, allow

Method used

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  • Switchable Valve Lifter Having a Mis-Assembly Indicator
  • Switchable Valve Lifter Having a Mis-Assembly Indicator
  • Switchable Valve Lifter Having a Mis-Assembly Indicator

Examples

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Example

[0014]Corresponding reference characters indicate corresponding parts throughout the several views. The exemplification set out herein illustrates one preferred embodiment of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention in any manner.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015]Referring to FIG. 1, a prior art SHVL 10 comprises a body 12. A pin housing 14 is slidably disposed in a first bore 15 in body 12 and retained therein by a spring seat 16 mounted on the end of body 12. A plunger 18 and pushrod seat 17 are slidably disposed within a second bore 19 in pin housing 14 for actuation by a conventional lash-adjustment mechanism (not appearing in the SHVL portion in FIG. 1). A lost-motion coil spring 20 is mounted on spring seat 16 and is captured by a spring tower 22 disposed within spring 20 and having a terminal flange 24. Spring tower 22 extends into second bore 19 and is captured therein by a tower-locking me...

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PUM

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Abstract

An improved SHVL for an internal combustion engine comprises an improved arrangement for locking a spring tower into a pin housing. The spring tower is provided with an annular OD groove as in the prior art. The pin housing ID groove is modified to have a two-step groove comprising two adjacent regions having different depths (different diameters) and having a distinct transition lip therebetween. A spring clip of the correct size seats properly in the spring tower groove and in the lesser-diameter pin housing groove, resulting in a correct overall length of the SHVL. Any oversize clip is caught between the lower lip of the spring tower groove and the transition lip of the two-step pin housing groove, resulting in a SHVL distinctly shorter than nominal, which is easily detected by either direct length measurement or a gauge.

Description

TECHNICAL FIELD[0001]The present invention relates to hydraulic valve lifters for internal combustion engines; more particularly, to a switchable valve-deactivating hydraulic valve lifter having an external lost motion spring and spring tower; and most particularly, to an improved arrangement for securing the spring tower to the pin housing that indicates when mis-assembly has occurred.BACKGROUND OF THE INVENTION[0002]Hydraulic valve lifters that are specially equipped for selective lost motion in an engine valvetrain to switchably deactivate an intake or exhaust valve are well known in the engine arts. In one form, such a “switchable hydraulic valve lifter” (SHVL) is provided with a lost motion coil spring that is captured on an end of the SHVL body by a spring tower. The spring tower extends within the body to mate with a pin housing that is slidably disposed within the body. When transverse locking pins in the pin housing are extended into engagement with the body, the SHVL is ri...

Claims

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Application Information

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IPC IPC(8): F01L1/14
CPCF01L1/146F01L13/0005F01L1/245
Inventor KANGAS, CARL R.BAUMAN, WILLIAM D.
Owner DELPHI TECH INC
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