Патент USA US2128414код для вставки
Aug. 30, 1938. F55, HEWEL ‘ 2,128,414 VALVE STEM GUIDE Filed March 28, 1936 WITNESS INVENTOR FAQ/7MB Hewe? $4M ' ATTORNEY 2,128,414 Patented Aug. 30, 1938 UNITED STATES PATENT OFFICE 2,128,414 VALVE STEM GUIDE Frank B. Hewel, Pittsburgh, Pa. Application March 28, 1936, Serial No. 71,403 ‘10 Claims. (Cl. 123-188) My invention relates to valve stem guides for K operation. and the like. One object of my invention is to provide a valve The valve stem guide 8 may be of any preferred form, being shown here as tapering upwardly from the bottom portion I3 through the middle or bottom portion l2, while the upper portion H Cl stem guide which will prevent sticking of the valve stems during operation thereof in the en gine, either by reason of expansion caused by heating of the parts or by friction or by reason of the suction of oil along the valve stem and the 10 consequent formation of gummy substances. A more speci?c object of my invention is to provide a valve stem guide having a structure so ‘designed as to completely prevent all causes of sticking of the valve stems by so treating the 15 upper and lower ends and the central portion of my valve stem guide in diiferent manners as to overcome their respective tendencies to stick for’ different reasons. Other objects of my invention will become evi 20 dent from the following detailed description taken 25 bore or enlarged opening l9 will be hereinafter pointed out in detail. The upper section II and also, if desired, the lower section l3 are provided with a plurality, here shown as four, of slots or cuts l5 which are ?lled with bronze inserts I6 brazed in place and smoothed off, whereby, by reason of the different Figure 1 is a view in longitudinal section, taken through a portion of an internal combustion coef?cients of heat expansion of the ferrous ma terial comprising the remainder of the valve stem guide and of the bronze inserts, the corresponding portions H and I3 of the valve stem guide do not stick to the valve stem during operation thereof by reason of the expansion of the bronze inserts. engine, embodying my present invention; , Figs. 4 and 6 are, respectively, a top plan and a bottom plan view of the structure shown in Fig. 2; and Fig. 5 is a transverse section, taken along the line V—V of Fig. 2. 7 Referring to the drawing, the structure here shown comprises a section of an internal com bustion engine I, including a cylinder 2, a recip rocatory piston 3 therein, the usual spark plug 4 at the head of the cylinder, a cam shaft 5 of a 40 usual character for reciprocating a valve stem 6, on the upper end of which a valve 1 is provided for controlling the ingress of combustible gas to the cylinder 2, and my improved valve stem guide 8, which is located in the usual position ‘in 45 the engine block near the cylinder 2 for properly guiding the valve stem 6 in its reciprocatory movements. Referring more particularly to Figs. 2 to 6, in— elusive, my improved valve stem guide, which is 50 preferably a unitary body composed of some suit able ferrous material, comprises an upper section II, a middle section or body l2 and a lower sec tion l3, all of which are treated in different man ners, as hereinafter more fully described, to pre 55 19 at the lower end of the guide, so that a cer tain annular space surrounds the valve stem 6 Where encased by the lower portion I3 of my valve stem guide. The purpose of this counter- 15 in which: along the line III—III of Fig. 2; 35 is of reduced diameter. A suitable opening or bore I4 extends from the top of my valve stem guide through the portions H and I2 and into the lower’portion l3 where it communicates with an enlarged counterbore in conjunction with the accompanying drawing, Fig. 2 is an enlarged view in side elevation of my improved valve stem guide or sleeve; Fig. 3 is a View in longitudinal section, taken 30 valve stem guide on the valve stem during its the valve stems of internal combustion engines vent sticking of_ the respective portions of my The central or body portion of the valve stem ' guide is provided with a relieved part comprising a plurality of internal circumferential grooves ll surrounding the bore l4,‘ thereby providing a series of alternating grooves I1 and ribs or bear ing surfaces l8. Consequently, when the central 3 portion of my valve stem guide is under high compression, by reason of the expansion of the surrounding portion of the engine block as a result of high heating thereof, the pressure ex erted on the valve stem by the central portion of my valve stem guide is reduced by reason of the provision of these alternate grooves and ribs. Thus, for the central portion of my valve stem guide, the tendency to stick is removed as a result of this reduction in pressure exerted on the valve stem. The purpose of the large counterbore l9 at the lower end of the lower portion l3 of my valve - stem guide is to break the vacuum or suction action that would otherwise occur along the valve stem if a tight ?t obtained between it and the lower portion l3. Consequently, the outer lower section or wall of the portion l3, in the ?rst place, acts as a shield or skirt to prevent the oil spray from actually hitting the enclosed portion of the 2., 2,128,414 valve stem, and secondly, there is thus practically prising an end portion having longitudinal slots no oil on that enclosed portion of the valve stem ?lled with inserts of a different coe?icient of heat expansion, a central portion having spaced con. tact with the valve stem to reduce pressure there on, and another end portion with a counterbore to be sucked therealong into the bore I4 during the reciprocatory movements of the valve stem. As a result of this absence of oil along the valve stem inside of the bore l4, there is no tendency in my construction to create carbon and gum on materially larger in diameter than the valve stem to prevent oil suction therealong during its recip the valve stem to cause it to stick. rocatory movements. ' It will be seen that I have thus provided a valve ' alternating grooves ll and ribs H8 in the middle 5. A valve stem guide of ferrous metal for pre venting a reciprocatory valve stem from sticking 10 therein comprising anv upper end portion having longitudinal 'slots ?lled with bronze, a central section and the enlarged counterbore I9 at the portion having a plurality of spaced internal ribs stem guide which embodies three different means, namely, the’ bronze inserts IE3 at the top, the the bottom, valvefor stem so guide treating as to the prevent respective theirsections particular :of j for contacting the valve stem to reduce pressure vthereon, and a lower end portion with a counter 15 tendency to cause the valve stem to stick therein, , bore materially larger in diameter than the valve As a result, my valve stem guide, as a whole, * ‘stem to prevent suction of oil into the central serves to prevent sticking of; the valve stem there in from any cause, thereby making for improved portion-of the vguide as the valve stem is recipro cated therein. operation of the internal combustion engine-3 in I 16. A valve stem guide for preventing a recip 20 which my valve stem guides are incorporated and rocatory valve stemfrom sticking therein com longer life of the valve stem and valve stem vguide. prising an end portion having inserts of a dif I do not wish toybe restricted to thespe'ci?c structural details or arrangement of parts herein set forth, as various modi?cations thereof may be effected without departing from the spirit and scope of my invention. I desire, therefore, that only such limitations shall be imposed thereon as are indicated in the appended claims. I claim as my invention: , > therefrom, said inserts extending to the edge of 2,5 said end portion. . ‘ 7. A valve stem guide for preventing a recip rocatory valve stem from sticking therein com prising an end portion having longitudinal slots extending to the edge of said end portion ?lled 30 1. A valve stem guide for preventing a recipg rocatoryj valve stem from sticking therein com prising a portion having metals of different .00 pansion for jointly contacting the valve stem and expanding away therefrom, said inserts extend e?icients of heat expansion for jointly contacting ing to the edge of said end portion. I the valve stem and expanding away therefrom, v8. A valve stem guide of ferrous metal fo.r‘pre~ w venting a reciprocatory valve stem from sticking a second portion having an internal relieved part to reduce pressure on the valve stem‘, and an other portion counterbored to prevent oil suction with inserts of a different coefficient of heat ex ' therein comprising an end portion having longi 2. A. valve stem guide for preventing a recip rocatory valve stem from sticking'therein com tudinal slots extending to the edge of said end portion ?lled with bronze inserts for jointly con ta'cting the valve stem and expanding away there .410 from, said inserts extending to the edge of said prising metals of different coefficients of heat ex end portion. along the reciprocatory stem. v _ . ‘ pansion for jointly contacting the valve stem and expanding away therefrom, internal pressure-re reciprocatory valve stem from sticking therein ducing means and oil-suction-prevention means. comprising an internally grooved central portion . 3. A valve stem guide forv preventing a recip rocatory valve stem from sticking therein’ com prising an end portion having inserts of a differ ent coe?icient of heat expansion, 'an internally— grooved central portion to reduce pressure on the valve stem, and another end portion with an enlarged opening surrounding the valve stem to prevent oil suction therealong during its recip rocatory 55 ferent coef?cient of heat expansion for jointly contacting the valve stem and expanding away motion. a i . 4. A valve stem guide for preventing a recip rocatory valve stem from sticking therein com v 9. A valve stem guide for preventing'a smooth to reduce pressure on the valve stem, said central portion directly abutting both end portions of said guide to form a unitary body. 10. A valve stem guide for preventing a smooth reciprocatory valve stem from sticking therein comprising a ‘central portion having a plurality of spaced internal ribs for contacting the valve stem to reduce pressure thereon, said central portion directly abutting both end portions of said guide to form a unitary body. ‘ FRANK B. I-IEIWEL.