SU1236135A1 - Bimetal piston for internal combustion engine - Google Patents

Description

The invention relates to mechanical engineering, namely, engine-building and can be used in internal combustion engines for the manufacture of engine pistons.

The purpose of the invention is to increase the reliability of the contact area of the ring holder with the piston,

FIG. 1 shows a piston with an insert and a groove for a compression ring cut with the intersection of a corrugation; in fig. 2 - corrugated insert; in fig. 3- scheme of efforts, acting, on their insertion at the moment of the piston operation; in fig. 4 is a diagram for calculating the ratio of the corrugation period to the thickness of the insert tape.

The piston of an internal combustion engine consists of a body 1, made for example of alloy AK4-1, and a corrugated insert 2 made of sheet steel 40Г1803Ф. Groove 3 under the piston ring

machined with the intersection of the corrugation. Piston ring 4 is in contact with insert 2, and the number of contact points can be varied by changing the number of bumps. The amplitude of the corrugation can be strengthened by the grooves of the remaining piston rings.

The piston with a corrugated insert works as follows.

When reciprocating the piston, the piston ring 4 installed in the groove 3 with a gap, because of the friction against the cylinder walls and inertial loads, hits the upper and lower walls of the groove. But since the groove is cut with the intersection of the corrugation, the piston ring 4 is in contact with the material of the insert 2, which prevents the broken grooves. The thickness of the corrugated collar and the period of the corrugations are chosen so that the ratio of the period of the corrugations to the thickness of the tape insert should be in the range of 2-42.

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Compiled by, Lobanov

Editor O. GolovachTekhred I. VeresKorrektor E. POIIJKO

Order 3003/34 Circulation 523Godice

VNIIPI USSR State Committee

for inventions and discoveries

1 13035, Moscow, Raushsk nab., 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (3)

1. BIMETAL PISTON FOR THE INTERNAL COMBUSTION ENGINE, comprising a housing with a groove for the upper compression ring and a reinforcing insert made in the form of an annular corrugated tape placed in the piston housing at the level of the groove for the compression ring, characterized in that, in order to increase reliability, the corrugations of the insert are arranged vertically, and the vertices of the corrugations are located symmetrically above the upper and lower ends of the groove. 2. The piston in π. 1, characterized in that the geometric dimensions of the insert are made in accordance with the ratio 4 ~ = ² - ⁴² · where L is the corrugation period; I is the thickness of the insertion tape. SU „„ 1236135 Fig /