US1339421A - Tappet for internal-combustion engines - Google Patents

Description

G. H. RICH. TAP-PET FOR INTERNAL COMBUSTION ENQINES. APPLICATION FILED JAN. 1'0. 191?- 1,339 ,4 21. P1161161 May 11,1920.

. I h /ya 7? 71360721.,

GEORGE E. RICH, or BATTLE CREEK, MICHIGAN.

Specification of tetters Patent.

'TAPPET FOR INTERNAL-COMBUSTION ENGINE-S.

Application filed January 10, 1917. Serial No. 141,661.

I To all whom it may concern:

\ citizen of the United States, and a resident of Battle Creek, county of Calhoun, and:

' for Internal-Combustion Engines, of which" and part ly in central vertical section Be itknown that I, GEORGE R. Bron, -a

State of Michigan,-have invented certain new anduseful Improvements in Tappets the following is declared to be a full, clear, and exact description. v p This invention relates to ternal combustion engines, and its principal object is to provide improved means for silencing the noise or clicking sound produced from the strikin of the tappet against the valve stem 0% the engine. To those skilled in the art towvhich this invention pertains, it is well linown'that a slight clearance is left between the tappets and valve stems of internal combustion engines, in order that the valves may be free to seat upon the valve seats during the compression and explosion strokes of the piston. v The clearancespace is slight but when the parts become worn this space increases and the noiseor clicking sound becomes more noticeable and anno ing. In the present device, the tappet an valve stem are-kept in constant contact, and the clearance space is provided in the tappet itself where a comparatively large bearing surface is provided for the contacting of the two relatively movable members of the tappet, and where oil or other lubricantiis maintained to lessen the noise and shock. V 1 a The invention consists in the several novel featuresclearly set forth in the following specification, and more definitely pointed outin the appended claims.

The invention is clearly illustrated in the accompanying drawing, in which:

Figure 1, 1s'a view, partly in side elevation through an engine body, and puppet valve 1nechanis'm,showing a tappet embodying a simple form of the invention;'-Fig.' 2, is a crosssection of the tappet taken online 2'-2 of Fig, 1; and Fig. '3, isla'view, partly inside elevation and partly in vertical sec-' tion', of a slightly modifiedform of the v'ention.

Referringto said drawing and first to- Figs. 1 and 2, the reference numeral 4, designates a fragment of the valve casing and 5, designates a fra tappets for in-' v ent "of the body of an internal combustion engine of common and well-known construetion. In accordance with the common practice, a puppet valve 6, controls the passage-way through the casing and is yieldingly held upon a seat 7, by a compression spring 8, encircling the valve stem 9,: of the valve, and bearing against a washer, secured upon the valve stem. A cam shaft 10, having a cam 11 thereon, is employed as usual for liftingthe tappet 12, and therewith unseating the valve. The tappet is slidably held inabearing 13, carried by the engine body 5. j

- In its preferred form, the. tappet comprises a tubular body portion 14, which slides in the bearing 13, and conveniently it may be formed with a disk-like, head 15, or

other bearing member that bears against the cam 11. In its preferred form, the bore of the tubular body portion, near its upper end, is of larger diameter than at its lower end to provide anannular shoulder or slat. 17, and slidably secured in the enlar ed part. of the bore is an internally screw t readed and having a set nut 21, threaded thereon,

which bears against-the tubular member 18, and fixedly locks the bolt 20,.and member 18, to ether. si esf22, at its upper end to accommodate 'a wrench when adjustment is 'necessary.=

The parts are so adjusted that when the valve is seated, and the low part of the cam is in contact with'the. tappet, a slight clearance spaceisleft between the lower end of the tubular member 18, and the shoulder 17; the set nut 21 is then screwed down tight against the tubular member 18. It is understood that the spring holds the head 20 of the bolt 20 in constant ckjvntact with the lower end of the valve stem 9, and also [yieldingly holds the lower end of said member 18' outfof contact with theshoulder 17.

The clearance space between the tubular member- 18, and shoulder 17, permits the valve to seat while the low part of the cam Patented May 11, 1920.

Said memberfil8 has flattened 1O moves down until it reaches the low part of contacts with the tappet. When the cam begins to lift the tappet, the shoulder 17, strikes the lower end of the tubular member 18, and thereupon the tappet body lifts the tubular member, and therewith the bolt 20, and valve 6. The shoulder 17, of the tappet body is held in contact 'with the tubular member until the low portion of the cam approachesthe tappet, and until the valve has become seated, whereupon the tappet body the cam, the spring 19, yieldingly supporting thetubular member 18 away from-the T well known to those skilled in this art.

set nut 26, locks the bolt and rod together; The adjustment for obtaining the desired" clearance space between the tubular member shoulder 17', and therewith holding the bolt 20 incontact with the valve stem, thus elimin ating the noise.

ierredform, and a tubular member 18, is slidably secured in the bore and spring pressed away from the shoulder.

In the bore of the tubular member 18, is a rod 24, which rests upon the bottom of the'bore 16, and the top of said rod is adjustablyconnected with the rocker arm 23, by a bolt 20, threaded in an internally screw threaded socket formed in the upper end of the rod,

241 and rockably connected to the rocker arm 23, by hinged joint or universal joint as is A 18, and shoulder 17 of the tappet body is obtained with the bolt 20", which may be screwed up or down in the socket of the rod 24. I g

More or less variation of the exact forms 'ber.

of construction of the invention shown and described is possible without departing from the spirit of this invention; I desire, therefore, not to limit myself to the exact forms shown but intend in the following claims to point out all of the invention disclosedherein. I claim as new, and desire to secure by Letters Patent: I '1..A tappet for internal combustion engines comprising a eentrally bored tappet body, having a cylindrical bearing surface spring in the lower part of said bore and confined between'the bottom of said tubular member and bottom of the bore and acting to unseat said tubular member, and a valve lifting member held in said tubular member.

2.- tappet for internal combustion engines comprising .a centrally bored tappet body, havinga cylindrical bearing surface throughout the major portion of its length, and having a closed end adapted to be directly engaged by suitable actuating means, the bore at the upper end of said tappet body being enlarged to. provide an internal annular shoulder, an internally screw threa ded tubular member in the upper enlarged part of said bore, the lower end of which is in close proximity to, andarran'ged to seat upon said shoulder, a.-coiled compression spring in the lower part of said bore confined between the bottom 'of said tubular member and bottom of the bore and acting to unseat the tubular member, and a valve lifting bolt, threaded in said tubular mem GEORGE R. RICH.

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