US1551948A - Tappet construction - Google Patents

Description

' Sept. 1,1925.-

.1.- A. GERMONPREZ TAPPET CONSTRUCTION Filed April; 50, 1921 gwuantoc Patented Sept. 1 1925 UNITED STATES v 1,551,948 PATENT OFFICE.

JOHN A. GERMONPREZ, or DETROIT, MIGHIGKAN; Assirmon or matron r. EVANS, or DETROIT, MICHIGAN.

ONE-HALF r 7 crnrrnr cons'rnucrron.

P Application filed April 30, 1921. Serial'iifl'o. 465,891. I

To all it may concern:

Be it known that I, JOI-II N A. GERMonp; PREZ, a citizen of the United States of--.-.

America, residing at Detroit, in the county of Wayne and State of Michigan, have in-t' vented certain new and useful Improve ments in Tap-pet Constructions, of which. the

following is a specification, reference being had therein to the accompanymg drawings.

In my companion application, Serial Number 434,487, filed- January 3,1921, I

have disclosed a valve operatin member ple and eflicient means. other than thatshown in my prior application .for holding the disk-in place and which'holding means is so constructed as to facilitate and cheapen manufacture.

A valve tappet or member which is op-- erated by a cam in avalve operating mechanism, is commonly arranged to loosely ongage and operate a valve lifting member, and it has been found that inefficient operation is sometimes occasioned by the wearing away and distintegration of the contact sur- I face carried by the tappet which is brought into contact with the'valve lifting member when the tappet is operated by the cam.

It is an object of this invention to provide simple and. eflicient means for preventing the wear and disintegration of this contact surface and thus obviate the necessity for hardening and grinding the tappet body or member carriedthereby which is brought into contact with the valve lifting member when the tappet is operated.

A further object is to provide a tappe't with a separate hardened contact member at each end of the tappet, one to 'form a hardened contact surface to be engaged by the operating cam and the 'other-to forma hardened contact surface'to. be engaged bythe valve lifting member,- saidhardened members being held in firm contact through out the faces in contact with the end of the tappet with unyielding seats atboth ends of modification of t 'tionillustrative of the tappet, saiol :5 hardened members and tappet forming a rigidunyiel'ding memberof unvarying length forming a part of the valve operating mechanism. v

With the above andother ends .1n view,

the invention consists in the matters hereinafter set forth and more particularly pointed out in the appendedclaims, reference be- 7 had to theaccompanying drawing in r w ich ,Figure 1 is section;

Fig. 2' is an elevation of the lower end portion or head of thetappet shown in Fig. l and illustrating a. slightly modified construction, parts beingv broken away and in section .to' more clearly show the construction;

Fig. 3is an elevation of an upper end portion of the ta p aside elevation of a tappet. illustrative of an embodiment of the invention and showing parts broken away and in et illustrating a. further e construction shown in- Fig. 1 and showing parts broken away andin section; I t

F 1g. 4 is as side elevation of another common form ofta-ppet wherein the sameis provided with adjusting means and a constructhe invention is applied to such 'tappet adjusting means, portions of the adjustment member and head being to more clearly broken away and in section disclose the construction, and

Fig. 5 isa detail showing the adjusting member of-the tappet illustrated in Fig. 4, in elevation and of slightly modified. construction, withportions broken away and in section.

As shown in Fig. 1 ofthe -drav ving, the tappet comprises a body or stem, 1 whlchis formed with the usual head 2 at one end and i this head is faced off at its lower side to provide aseating surfac for a hardened" disk 3, which disk is' held in place-and in' firm seating contact throughout the entire inner face with the end'surface of the head,

by a holding ring orband 4. Thisholding ring has an inwardly inclined upper edge portion 5 to engage aclined peripheral edge also formed with an inclined. edge portion 6 along its lower edge to engage an inclined or beveled peripheral edge of the'hardened disk 3.

In the manufactureof these tappets, by

correspondingly in-- of the head and is means of a suitable press andd ies, the disk is forced into firm seating contact throughout the entire inner face, with the endsu'itface of the head and the holding ring is simultaneously forced intofirm contact with the head and its dge portions or flanges 5 and 6 bent inwardly and formed down firmly upon the inclined peripheral edges of the head and disk. The hardened disk which forms the hardened contact'surface for thehead to be engaged by an operating cam of a valve operating mechanism, thus firmly seatedfand held in place upon the'tappet head by means of a third member or ring 4t which may be very cheaply and quickly applied by th same machine and during the same operation which seats the disk upon the head in the manufacture of the tappet. v y

In the modified construction shown in Fig. .2, the head 2 is formed with a peripheral groove 7 to receive the upper flange 5 of the holding ring 4 so that the .upper inclined surface of .the head willbe a smooth,

15 flush surface, giving a neat appearance and providing a. better. hold for the ring upon the head.

In- Fig. l'the upper end of. the body orstem 1 of the tappet is formed with a recess 8 to receive a. hardened disk 9 adapted to form a hardened endcontact surface for the tappet, andthis disk is firmly held in i 1 its recessby bending inwardly the upstanding edge portion or flange 10 on' the body) 1. which surrounds the recessfsaid flan e 'eing forced into firm engagement wit the beveled peripheral edge 11 of the disk.

The. hardened disk is'thus' firmly hel d'in the recess of the end of the body and in 40 firm seating contact throughout the entire inner face withthe bottom of this recess,

' by the inbending ofthe peripheral flange 10 which is formed by the recessing of the end of the body. The body is therefore 'provided with a very hard wear surface I without the necessity for hardeningand I grinding the end of the body, which hardeningprocess' is diflicult to perform 'with a certainty of securing the exact hardness desired so that .it will not be so hard as to be liable to crack in use and will not be so soft as to cause wear in operation. There the body is hardened, it is .necessaryto grind it after the hardening operation and 55 thus the cost of manufacture is increased.

By recessing the end of the body and setting a hardened disk into this recess, grinding of the body is .obviated and a contact surface provided which will 'be of the desired hardness to withstand the wear, and

as this disk is in firm contact with the bottom of the recess throughout the entire area of the inner face of the disk, said disk in effect becomes. an integral part of the body and liability of its becoming loosened under operating conditions and broken by the hammering action of the member contacting therewith, is obviated.

In the construction just described which is substantially the same as that disclosed in the companion application previously mentioneda very heavy pressure is necessary to force the peripheral flange 10 into firm contact with the hardened disk and .it is extremely difficult to avoid causing flexure of the thin disk. In the companion application the flexure thus pro luced is desirable and accomplishes a use .1l function,

but where it is desired to S\ cure a flat plate upon a fiat seat, fiexure of the thin plate would leave an undesirable space betweenthe inner surface of they plate and the end of the tappet body. Annular rings .of' the form illustrated in all of the figures may be used' to-hold afiatjdi'sk firmly in contact with a Hat seat without producing fiexure "of the disk. The annular holding ring of steel placed upon the oppositely beveled surfaces of the peripheries of the, tappet and of the plate, exerts a wedging action hich maintains a permanent firm engagement of the abutting surfaces.

' The common form of tappet shown in Fig. 4 comprises a body 1 and an adjustable threaded stem 12 which is screwed into a longitudinal axial opening in the upper end 013 the body -1, and ahead 13 on said stem,

aflock nut 14'being providedon the stem to engage the end of the body andhold the adjustable member-in the position to which it is adjusted to change'tlie over-all' length of the tappet. The upper contact and of the tappet, which in this construction is the end faceof the head 13, is formed by a hardened disk which-is secured in a recess in the end of thehead in the same manner and by the same means as said disk 9 shown in Fig. 1V is held in place. Y

A' modified construction of adjustable tappet'member is shown in Fig.5, the head 13 beingformed with a projecting end portion l5-which isfaced off to provide a seating surface for the hardened disk 16, and this for and method of securing the disk 9 directly to the end ofv the tappet body, .is

shown. In this modified construction, the tappet; body is formed .witha projecting 95 member carried by the upper efid of the body, said member consisting of a screw-' end portion 20 similar to the portion of the head 13, and the hardened disk 21 is secured upon the fiat end surface of this portion by means of a securing ring 22 similar to the ring 17 and which is formed and applied in a like manner.

Obviously the form and construction of the several parts may be further varied within the scope of the appended claims without departing from the spirit of the invention and I do not therefore limit myself to the particular construction shown.

Having thus fully described my invention, what I claim is 1. As a new article of manufacture, a tappet comprising a member having a fiat end surface, a disk of thin hardened steel seated upon said surface and un-stressed, and a separate annular securing member having an edge portion formed inwardly over a peripheral edge portion of said disk,

and an edge portion formed inwardly upon a peripheral edge portion of said member whereby said edge portions of the securing member are stressed to hold said disk firmly seated'upo'n said end surface of said member without stressing the disk.

. 2. As a new article of manufacture, a tappet comprising a member having a flat end surface and a peripheral beveled edge, a disk of thin hardened steel seated upon said. surface and formed with a beveled edge, the beveled edge portions of said member and disk being inclined inwardly, and a separate annular securing member having edge portions formed inwardly against said beveled surfaces of said member and disk with said edge portions stressed to firmly contact said surfaces.

In testimony whereof I affix mysignature.

J OHN'A. GERMONPREZ.

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