US1290297A - Internal-combustion engine. - Google Patents

Description

A. G. L. s. H. C. W. NHGHBUUR.

INTERNAL C'DMBUSTIUN ENGINE.

APPLICATIQN f/ILED OCT. 8. 19H.

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ARTHUR er. I.. NEIGHBOUR ANDRARRY o. w. NRIGHROUR, or BRIGHTON, VICTORIA,

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i INTERNL-COMBUSTION ENGINE.

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Application led October 8, 1917.

To all ywhom t may concern Be it known that we. ARTHUR GEORGE LLoYo NEIGHBOUR and HARRY CROIL WYNSNE NRTGHBOUR, subjects of the King of Great Britain, residing at Brighton7 in the `State of Victoria, Commonwealth of Australia, have invented new .and useful :improvements in internal-Combustion Engines, of which the following is a specification.

This invention relates to improvements in internal combustion engines and more `particularly to that type of valve used therein which is operated by a push-rod or tappet carried in a fixed guide and" interposed be* tween the cam and the end of the valve stem.

Valves of this type are commonly used inv the engines of motor vehicles, motor-boats and also in those employed for stationary purposes.

The invention has for its object theprovision of partsto inclose the external portions of the tappet, valve-stem and valve spring for the purpose of reducing noise, keeping the parts clean and preventing the escape of lubricating oil.

A salient feature of the invention consists in the provision of means whereby the` parts designed to inclose the external portions of the tappet, valve-stem and valve spring can be employed to facilitate the removal and replacement of the valve and coacting parts when required.

It is well known to motorists and attendants of internal combustion engines that the removal of a valve and spring is often a matter of diculty as it is necessary to hold` the valve down and at the same time to compress the spring before the cotter pin which passes through the valve-stem can be withfl drawn. Special tools are used for this operation.

i Specification Of Letters Patent.

Patented Jan. 7, 1919.

serial no; 195,229. Y

of reference indicate like parts and in which Figure l isa view in vertical section of portion of the cylinder of an internal combustion engine and `illustrates the application of the invention to a valve and the coacting parts thereof.

Fig. 2 is a view in vertical section of portion of the cylinder of an internal combustionengine and showsV the manner in which a valve may be removed.

Fig. 3 is a detached `view partly in vertical section and partly in side elevation of the essential parts of the invention.

Fig. 4 illustrates in vertical section a modification of the invention.

\ Fig. 5 is a detached view in horizontal section of the clamping means employed in Fig. 4.

Fig. 6 illustrates in plan one half of the tappet cover shown in Fig. 4.

Fig. 7 illustrates in vertical section the manner of removal or replacement of a valve spring by the invention.

The numeral 1 designates a hollow cylinder which projects upwardly from that part of the crank-case which contains the camshaft. This cylinder is removably secured at its lower end preferably to the top of the tappet guide 2 as by screw-threading, or it may slip over the said guide 2 and be fixed in positionin any approved way.

The hollow cylinder l at its lower end projects inwardly as at 3 and is externally formed at 4 so as to fit a Spanner for removal purposes. `The cylinder concentri cally surrounds the external parts of the tappet 5, the lower portion of the valveV spring G and valve stem 7, and forms the lower member of the cover.

i A second hollow cylinder 8 depends downwardly from the underside of the valve casing and is detachably secured at its upper end preferably to the valve guide 9 in an approved way as by means of a bayonet joint 10. This hollow cylinder 8 chiefly surrounds the upper external parts of the valve mechanism and forms the upper member of the cover. The lower end of the cylinder 8 iitsinto the upper end lof the cylinder l, but is not secured thereto, and the said cylinders form a cover to completely inclose the i valve stern, valve spring and tappet.

The upper cylinder 8 is provided with an inwardly` projecting fiange 11 and is thread- Ile ed externally at its upper end. The lower cylinder 1 is threaded internally at its upper end, the latter thread being of suitable diamelter and pitch to fit the thread on the cylinc er 8.

In order to effect the removal or replacement of a. valve, the valve cap 12 is taken out in the usual way, the cylinder 1 is released at its lower end and raised to form a screw engagement with the cylinder 8. Said cylinder v1 is of such length that after being given several turns the inwardly projecting` portion 3 thereof contacts with the underside ofthe washer 13, which fornisthe seat kof the valve spring 6, and rests upon the cotter pin 14. On the further turning of the cylinder 1 the washer 13, which has its underside shaped to fit lthe lower .end of said'cylinder, is raised thereby compressing the valve spring 6 until all pressure is taken ofi the cotter pin 14: which then stands-clear of the said washer 13 fand said cylinder 1 (see Fig. 2) and may be easily removed without any risk of 'injury to "the 'ha-nd by the suddeny descent of the spring 6. The valve can then be withdrawn in the ordinary way through lthe top of the valve chamber.

The operations will be facilitated if the engine be rotated until the cam lifts the valve to its full extent, as will be readily understood.

The cylinders l1 and 8 may be left in the position retaining the spring `iii-compression until the valve is ready for replacement. The cotter pin 14 is then reinserted and the'c'ylinder 1 unscrewed from-the cylinder S which permits the washer 1 3 to again rest upon the said cotter pin. The lower cylinder 1 is then dropped down and screwed into its normal position 'forming with the upper cylinder 8 a cover asbefore deScribed.

For the removal and replacement of a spring' only, it is unnecessary 'to remove the valve'cap. The Cotter pin 14 is removed asjbefore described and thecy'linders 1 and 8 are screwedfup until their combined length is short enough to permit of their'being' passed diagonally downward between the valve stem 7 and tappet 5 as shown in Fig. 7,

'the bayonet joint 10 having been Vfirst disconnected.

Owing to the underside of the washer 13 being` taperedand a corresporiding taper being' given tothe cylinder 1 at its lower end the said -washeris ,permitted to cant sulii cient-ly to insure easy engagement vor disengagement thereof with the valve stem 7. The two cylinders 1 and 3 .are then disengaged and thespring 6 removed,Vr j

To replace a spring it is inserted in the upper 'cylinder andthe washer'13 is ,placed in the lower cylinder 1. The cylinders are then screwed-together effecting 'a compression of the spring between the 4 inwardly pfejeain'g portion e-of-theiower Vcylinder i before described.

and the flange 11 of the upper cylinder 9 until the combined length oi the two cylinders is such as will permit of the upward passage thereof past the valve stem 7 and thetappet 5, see Fig'. 7.

The bayonet joint 10 is then engaged with pins 15, the cotter pin 1l reinserted. and the lower cylinder 1 unscrewed and fitted as The upper cylinder S is secured rmly in position by the thrust o'l the spring 6 upon the flange 11 a lter replacement of the cotte-r pin 1l.

The bayonet joint 10 is provided tor convenience in handling' as it prevents the upper cylinder 8 from dropping down while the lower cylinder 1 is beine' screwed up or unscrewed.

From the above description it will he ohvious that a spring is initially compressed in the cylinders quite apart from the engine.

iVith large engines having' powerful valve springs, suitable spanners may he used to screw up the cylinders without any difiiculties-due to limitations of space which arise when the springs are first placed in position in the engine and then compressed by 'levers in the ordinary way.

Then the tappet 5 requires adjustment the lower cylinder 1 is raised and screwed on the cylinder 8, but not sufiiciently 'liar for the washer 13 to contact with the portion 3 of said cylinder 1.

In Fig'. 4 of the drawings there is illustrated a modification of the invention suitable for use with internal combustion engines subject to vibration and in which space, is limited, such for example as those fitted to motor-cars and motor-cycles. The external thread on the upper cylinder S extends tothe -lower end thereof and the two cylinders 1 and 8 normally remain in engagement thereby avoiding' any ditiiculty as would be caused by the presence et dust and dirt in engaging' the threads.

Owing to limitation of. space in such eu- `eines, there is `generally insufficient room to perm-it of the lower cylinder 1 heine` at tached directly to thc tappet guide '2. Said cylinder terminates a short distance. below the washer 13 with the inturned part 3 in close proximity to the underside oi said washer, but sufficiently far away to prevent contact of said parts when the engine is running.

A circumferential groove 16 is formed around the lower end oil the cylinder 1 and a similar groove 17 is formed in the tappeti guide 2.

lill? A third hollow cylinder or chamber 16 surrounds the tappet 5 and is provided with inwardly projecting flanges 19 and '2O adapted to fit the Igrooves 16 and 17. respectively.

The cylinder 18 is formed in two halves whichare retained in placeI bv a clip '21 secured 'inposition by a clamping-screw 22.

In orderto prevent displacement of the clip 21 it may be made with teats 23 adapted to engage with indentations 211 formed in the members of the cylinder 18. j i

1n order to remove or replace a valve or spring the clamping-screw Q2 is slackened sufficiently to permit the clip E21 `to be dropped down when the two halves of the cylinder 18 are removed laterally. By this means the lower Acylinder 1 is released and is screwed up to free the Cotter pin 14 and the same operations are carried out as before described. r

When replacing the parts the cylinder 1 is screwed down until the two members of the cylinder 18 can be placed in position with the flanges 19 and 20 fittingthe grooves 16 and 17, respectively. The band 21 is then placed in position and the clampingscrew 22 tightened, resulting in all the parts being securely locked.

The cylinders 1 and 8 may be connected by bayonet joints similar to the joint 10, or they may be connected in any other suitable manner to hold the spring under compression. c

While we have described preferred constructions of the invention we are aware that modifications may be made within the scope of the appended claims and therefore we do not limit ourselves to the precise terms em ployed. e

What we do claim is 1. In internal combustion engines, the combination with a valve and coacting seating spring to control the opening and closing of fuel intake and exhaust ports, of means to normally inclose the valve and coacting parts and operable to facilitate the removal or replacing of the valve and coacting parts, comprising extensible tubular members arranged to be releasably secured to a fixed part of the engine in extended position, and when released adapted to be shortened to compress the spring and having means to secure the members together in their shortened condition to retain the spring compressed.

2. ln an internal combustion engine, the combination with a valve and coacting seating spring to control the opening and closing of fuel intake and exhaust ports, of means to facilitate the removal or replacing of the valve and coacting parts, comprising, tubular extensible members having inwardly projecting parts at the outer ends whereby to releasably secure the members to fixed parts of the engine to inclose the spring and coacting valve parts, and said members having means of adjustable connection between said members, when telescoped, so as to hold the valve spring compressed between said projecting parts for the purpose specified.

3. ln an internal combustion engine, the combination with a valve and coacting seating spring to control the opening and clos `of fuel intake and exhaust ports, of means to facilitate the removal and replacing of the valve and spring, comprising interfitting extensible tubular members arranged to be releasably secured in extended position `to fixed parts of the engine' to in close the valve springs and coacting valve parts, and adjustably secured in position to compress thesprings and retain the same in compressed position in `conjunction with the valve spring washer.

4. In internal combustion engines, the combination with a valve and coacting seating spring `to control the opening and closing of fuel intake and exhaust ports, of means to facilitate the removal or replacing of the valve and coa-cting parts, comprising upper and lower tubular covers to inclose the spring and valve parts, inwardly projecting parts on said covers to engage the valve spring for compressing said spring, and means of adjustable connection between said covers arranged so that the valve spring may be compressed between the inwardly projecting part on the upper cover and valve spring washer.

5. In an internal combustion engine, means for facilitating the removal or replacing of the valve and coacting parts, co-mprising two cylindrical telescoping covers provided with inwardly turned shoulders at the outer ends and an adjustable screw connection between said covers so arranged that the valve spring can be compressed between one of said inwardly turned shoulders and the valve spring washer and the length of said covers reduced for removal and replacement.

6. In internal combustion engines, the combination with a valve and coacting seating spring to control the opening and closing of fuel intake and exhaust ports, of means for facilitating the removal or replacing of the valve and coacting parts, 110 comprising two interlitting tubular members to form a cover for the valve and its parts, one of said members having means for detachably connecting it to the crank case of theengine and the other to the valve 115 chamber, and saidmembers having adjustable means of connection whereby the valve spring may be compressed, as and for the purpose set forth.

7 1n an internal combustion engine, 120 means for facilitating the removal or replacing of the valve and co-acting parts, comprising a cover formed of two interlitting hollow members, the upper of which is adapted to be detachably connected to the 125 valve guide and is furnished with an inwardly projecting flange at its upper end, the lower of said memblers being screw connected to a tappet guide and formed with an inwardly projecting part at its lower end, 130

said hollow members being' capable of ad'- justahleconnection by internal and external threads, as and for the purposes set forth.

8. In an internal combustion engine, means for facilitating the removal and replacement of a valve and its co-acting parts, comprising two interitting cylinders forming' a valve 7cover and having adjustable means of connection, an inwardly proj ecting member on each of said cylinders, a tappet cover Lformed in two parts fitted to the lower of said interfitting' cylinders, and means for retaining said tappetcover in position.

9. In `an internal combustion engine, means for -facilitating the removal and replacement of a Valve and its co-acting` parts, comprising two -interfitting cylinders forming a Valve cover and having adjustable means of connection, an inwardly projecting member on each of said cylinders, a tappet cover formed in two parts fitted to the lower of said cylinders and to the tappet guide, and a clip and clamping-screw for detachably retainingthe parts of said tappet cover in position and lockingand preventingr displacement of said cylinders.

In testimony whereof we aiiX our signatures in presence of two witnesses.

ARTHUR G. L. NEIGHBOUR. HARRY C. W. NEIGHBOUR.

Vitnesses A. J. CALLMAN, M. Rossr'rrm.

Copies of chisrpatent may ne-obtained for ve cents each, by addressing the "Commissioner of Patents,

Washington, D. C.

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