US1713524A - Piston for gas engines - Google Patents

Description

y 21, 1929- R. w. ELAND ET AL 1,713,524

PISTON FDR GAS ENGINES Filed Nov. 28, 1927 I IE. j v I gwwmfoz Pat ent ed May 21, 1929.

1,713,524 PATENT OFFICE.

W. BLEND AND I IARREL C. MILLER, 01 PEOBIA, ILLINOIS.

PISTON ron ens Enemies.

Application fled November as, 1921. Serial no. 230,121.

This invention pertains to pistons for internal combustion engines. An object'is the provision of a type of piston whose upper portion, or that carr' ing the piston-rings 1s spaced from the ho y portion or skirt and separable therefrom whereby it may be removed vfrom the cylinder for replacing or adjustin such rings and without taking down .518 entire engine as is usually the case.

Another object is to construct a piston having a ring-carrying portion and a skirt portion are spaced from one another for the purpose of both lightening the whole structure and reduce friction, as well as to minimire the feeding of oil -to'the piston ring portion 1 Another object is to build apiston of spaced portions in skeleton form both to reduce wei t, and that the oil instead of being carried too freely to the piston ring portion ma more readily returnto the crank-case.

. till another'objectis the provision of a body rtion of an open skeleton structure, the skirt of which is severed at opposite po-. sitions and so constructed that it will automatically expand as-it wears and prevent the well known slap. In addition to these objects the invention includes certain detailsof construction to be pointed out herein and form the subject of certain of the appended claims. Asan as- 'sistance to the understanding of the invention' the attached drawing is provided wherem h V v Figure 1 is an elevation in part section of the complete, ammbled' piston -of our invention;

tion.

4 Fi 2 is a side elevation of a body portion including a skirt, the same being viewed from a different position from that in Figure 1., I i

Figure 3 is a plan of the said body por- The piston comprises two portions or sections designated by the characters 1 and 2. The portion 2 comprises a skirt 3 surmounted by a shell-like boss or extension 4integral with said skirt and including lateral hous-' ings 5 bored to receive the usual wrist-pin 6 to which the connectin -rod 7 is clamped in customary manner. tis observed that said boss or extension 4 has an opening 8 extending: well up into it, also that the top of said skirt 3 is openat 9,9 at opposite sides er and outside the boss 4and that it is severed at 10 at diametrically opposite sides,

the boss 4 proje'ctingbeyond the same to 0 while the portion 1 has acentral bore 15 through w ich the extremity of the screw pames when the said portion is seated in position, there being a nut 16 to engage the screw-end, the same being held from turning by means of a split key or cotter 17 for example, passing through said screw-end. commonly constructed pistons are of one piece or casting and when necessary to replace acking rings the oil pan must be re moved rom the crank-case and the connecting rod must be removed from its position on the crank-shaft in order to be enabled to withdraw the piston from the cylinder. This is laborious and r before the engine is again ready for use. However, by the construction herein provided the mere withdrawal of the pin 17 p and removal of the nut 16 rmi'ts the piston ring section to be remov and only requiring that the engine head he dismounted.

We are aware that pistons have been made with split skirts but their forms have not been such that a wide limit of. expansion was possible, besides which the wear thereon was nrily uneven due to the length of the skirt and the form of the piston as a whole. However, by constructing the body of. the' piston in a bifurcated form about as illustrated herein and short skirt portion w ich at t e same time Is severed at oppodte sides in the manner uired much time.

rovidi a relatively shown the two portions of the said body can expand more or less under heat in practically a uniform manner. In practice itis our custom to make the skirt several thousandths of an inch oversize and by a suit- 'able contracti as wearcon-- up into the boss 4 much latitude for expanslon is allowed the said body, beingso designed that all (parts of the surface of the" sklrt can expan into intimate contact with the cylinder walls.

By having a separation of the two portions 1 and 2, if an excess of oil reaches the space between them it is caught by the upper surface of the skirt 3 and may pass back to the crank-case, not shown, through the openings 9 and the places of separation at 10.

Another advantage arises from the form of piston used in that there is less metal to retain heat and that What heat is taken up by the portion 1 is rapidly carried downto the skirt portion 3 and conducted to the cylinder walls.

We claim: 4

1. A piston for internal combustion engines having a relatively short skirt portion, spaced piston-pin bosses surmounting the same, the bores of the bosses for the pistonpin lying outward from the plane of said skirt portion, and an arched extension connecting the bosses, the whole being an integral structure, a piston-head separate from the named structure, spaced from said skirt portion and resting upon the arched extension and having a bore, a member screwed into the extension projecting beyond the outer surface of the same and extending through the bore of saidhead, a nut cngaging the member securing the head upon the extension, and means to fix the nut With respect to the member.

2. A piston for internal combustion en.- gines having a relatively short skirt portion,

.spaced piston-pin bosses from one side thereof, the axes of the bores of said bosses being spaced from the plane of said side, an extension arched across the space between the bosses, the same being integral with said bosses and having a substantially flat surface at its extremity lying in a plane paralleling the axes of said bores, a screw engaging in the extremity and extending through it and beyond the fiat surface thereof, a separate cupped head inverted .upon the extension, the same being spaced from the skirt portion and having a surface complementary to said flat surface of the latter, resting thereon, and having a bore through which the screw extends, 'a nut engaging the screw and bearing upon the head securing the same upon the extension, and a pin extending through the screw for fixing the nut with respect to said screw.

3. As part of a-gas engine piston a relatively short skirt portion severed at substantially opposite positions and having spaced piston-ring bosses erected upon thesame outward from the plane thereof and whose bores lie outward from the sprfaces carrying the bosses, and an arched exctension connecting the bosses terminating a its end in a substantially fiat surface, the whole being an integral structure.

In testimony whereof We affix ou-r signa tures. A

REINHARD 'W. ELAND. LARREL C. MILLER.

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