US2826808A

US2826808A - Disassembly tool for hydraulic valve tappets

Info

Publication number: US2826808A
Application number: US376812A
Authority: US
Inventors: Arnold J Pritchard; Elmer M Mickley
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-08-27
Filing date: 1953-08-27
Publication date: 1958-03-18
Anticipated expiration: 1975-03-18

Description

March 18, 1958 A J PRITCHARD ET AL 2,826,808

DISASSEMBLY TOOL FOR HYDRAULIC VALVE TAPPETS Filed Aug. 27, 1953 m m a 0 m .I.CV9 Wu m a W 4 W 8 Mr W 2 mm ma 6 AH Y 2/ W. B .6 mm 4 3M0M 4 1P 7 h v 1 AI 2 l 5 ZwZ l m F DISASSEMBLY TOOL FOR HYDRAULIC VALVE TAPPETS Arnold J. Pritchard and Elmer M. Mickley, Carnegie, Okla.

Application August 27, 1953, Serial No. 376,812 2 Claims. (Cl. 29-282) This invention relates generally to automotive tools a d p ta more partic l rly o a p d me nism for removing and disassembling hydraulic valve tappets.

Internal combustion engines utilizing hydraulic valve tappets are not susceptible to undue service requirements insofar as this type of valve tappet is concerned with the exception that hydraulic valve tappets must be periodically removed and cleaned to remove deposits of gum and varnish which form thereon during normal service of the engine. These gums and varnishes not only tend to impair the operating eflic-iency of hydraulic valve tappets but also make it extremely ditficult to remove these assemblies from the engine block.

Therefore, it is the primary object of this invention to provide an improved hydraulic valve lifter removing and disassembling tool which not only permit hydraulic valve tappets to be easily removed from an associated engine block but also provides means whereby the component parts of the lifter may be easily disassembled after removal from the engine block.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numeral refer to like parts throughout, and in which:

Figure 1 is a vertical section taken through a hydraulic lifter assembly showing the improved tool in operative position therein;

Figure 2 is an elevational view showing the manner of utilizing the tool for disassembly after the tappet is removed from the engine;

Figure 3 is a horizontal section taken substantially along the plane of section line 3--3 showing details of the assembly on an enlarged scale; and

Figure 4 is a perspective view of a portion of the extractor assembly.

Referring now more particularly to the drawings, reference numeral 10 indicates generally an internal combustion engine cylinder block and the reference character 12 indicates generally a hydraulic valve lifter or tappet associated therewith and correlated with a cam shaft 14 in a manner well understood in the art. The lifter includes a main body port-ion 16 having a lower chamber 18 therein surrounded by a shoulder within which a plunger 24 seats at its lower end. It is to be understood that the hydraulic valve tappet also includes a push rod seat and a retainer ring therefor at the upper end of the assembly as is conventional it also being understood that these parts must be removed for the purpose of using the hereinafter described tool and that the drawing does not show such elements inasmuch as they are conventional and well understood in the art.

As is also conventional, the chamber 18 receives a compression spring 22 which urges a valve ball 24 into closing engagement with an oil port 50 for proper operation of the hydraulic valve tappet.

nited States Patent 2,826,808 Patented Mar. 18, 1,958-

The main portion of tool is indicated generally by the reference character 26 and includes a handle portion 28 terminating at one end in an enlarged boss 30 which is apertured and threaded as at 32 and which is provided with a depending expanding collet 34 at its lower end. The expanding collet is longitudinally split as indicated by the reference character 36 to provide the depending finger members 38 and these finger members are provided at their lower ends with the inwardly tapered wedge portions 40 in a manner shown more clearly in Figure 1,

An elongated expansion screw 42, provided with an enlarged hexagonal head 44 at its upper end, is threaded through the aperture 32 and extends downwardly within the expanding collet 34. The expansion screw 42 is provided with the tapered shoulder 46 engageable with the Wedge portions 40 of the finger members 38 and the lower end of the expansion screw terminates in a ball 48 for seating upon the surface of the lower end of the plunger 20 surrounding oil port 50. The expansion screw is also provided with a longitudinal bore 52 and a Zerk fitting 54 at its upper end in the manner shown.

In using the removing and dissambling tool, it will be manifest that the hydraulic valve tappet retaining ring and push rod seat are removed from the hydraulic tappet assembly the expanding collet 34 is inserted within the plunger 20 and the expansion screw 42 is rotated until the tool assembly is in the position shown in Figure 1 wherein the ball 48 has sealed the bore 52 to the oil port 50 and the finger members 38 are in firm engagement with the inner surfaces of the plunger 20. Thereupon the entire valve lifter assembly may be removed from the associated engine block by merely lifting upwardly on the tool handle 28. Since the Zerk fitting 54 is provided with the usual spring floated ball check valve therein, and since the ball 48 of the expansion screw 42 has sealed the oil port 50 to the oil-filled chamber 18, sufiicient suction will be created to efiectively link the members 16 and 24b for simultaneous removal thereof.

When the hydraulic valve tappet assembly has been removed from the engine block, the tool handle 28 is inserted in a vise 56 and pressure is applied through the Zerk fitting 54 by means of a suitable gun 58 or any other suitable mechanism so that the main body portion 16 of the hydraulic valve tappet is hydraulically forced off the plunger 20 so that the tappet assembly may be cleaned and reassembled for installation in the engine block.

It will be readily apparent that correct use of the above described tool assembly Will effect an extremely rapid removal and disassembly of hydraulic valve tappets which has heretofore been a laborious and time-consuming operation and one which necessarily required rather rough usage of the hydraulic valve tappet assembly.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims.

What is claimed as new is as follows:

1. A disassembly tool for a hydraulic valve tappet of the type having a tubular main body portion surrounding a tubular plunger provided with a central oil port in its bottom, comprising a handle having a boss at one end and an expansible extractor element depending therefrom, said extractor element being adapted for insertion within said plunger, means for expanding said element into engagement with the inner wall of said plunger, said extractor element consisting of a longitudinally split housing having enlarged cam portions at its free end, said means including an elongated member threadedly engaged in said boss and having tapered portions engageable with said cam portions for expanding said extractor element, said elongated member also having a tapered lower extremity for engagement with the said central oil port, said elongated member being provided with a longitudinal bore therethrough, and a check valve mounted on the upper extremity of said elongated member in com municationwith the bore in the latter.

2. A disassembly tool for a hydraulic valve tappet of the type having an outer cup-shaped main body portion slidably enclosing an inner cup-shaped plunger provided with a central oil port at the center of its bottom, comprising: a handle portion; an enlarged boss formed on one extremity, of said handle portion; a tubular, split collet formed on and extending sidewardly from said boss and adapted to be inserted in the outer body portion of said tappet; an expansion screw threaded through said boss and extending axially of said collet; a wedge portion formed on said screw positioned to exert an expanding action on said collet when said screw is rotated; a downwardly extending lower extremity on said screw positioned below said wedge portion and adapted to close said central oil port when said screw is screwed into said collet; and an axial oil passage formed in said screw through which oil may be forced under pressure through said port to cause said plunger to rise in said outer body portion.

References Cited in the file of this patent UNITED STATES PATENTS 1,246,415 Gerrish Nov. 13, 1911 2,607,620 Oliveri Aug. 19, 1952 2,619,717 Gober Dec. 2, 1952 2,671,262 Kuniholnr Mar. 9, 1954 2,754,574 Clarke et a1 July 17, 1956 2,755,540 Crozier July 24, 1956 FOREIGN PATENTS,

18,977 Great Britain Aug. 18, 1909