SU1312216A1 - Aluminium-alloy piston for internal combustion engine - Google Patents

Abstract

The invention relates to engine-building and improves reliability by improving cooling and simplifying the design. The annular riizist insert 1 is located in the zone of the upper compression ring. The upper and lower portions 7 and 8 are connected through an annular bridge, the magnitude of which provides the thermal coupling and mechanical strength of the connection of these parts. The annular tube 4 is made by bending around the circumference with the mutual tight connection of its ends. The tube 4 may be made with an ellipse cross section, with corrugations along the annular surface in a part of the tube or with a comb from the side of the body. In the manufacture of such a design of the piston, there is no need for the generation of gases from the tube, because during the pouring process, all the gas remains inside the annular sealed metal tube. 3 hp f-ly, 5 ill. I (L N3 GO Figure 1

Description

The invention relates to mechanical engineering, in particular, to the design of pistons with a non-risperous insert, with dust to cool the pistons with oil in the region of the upper compression rings, 5

The purpose of the invention is to increase reliability by improving the suspension and simplifying the design.

FIG. 1 shows a piston; in fig. 2 shows an embodiment of a piston with corrugations on the annular tube of the cooling channel; in fig. 3 is the same cross section along the piston insert and the annular tube; in FIG. 4 - option

the ability to create optimal conditions for cooling the piston, creating the necessary temperature barrier. Orbital angle o / tilt of the major axis

with cvi

horizontal layout

  i.e.

ten

n

I

The scientific research institute of the axis sharply decreases the annular jumper K and thereby weakens the mechanical strength of the connection between the upper 7 and lower 8 parts of the piston.

 FT

Increase ot angle

removes the top of the ellipse from the hot top

l have t-.f ... ..

execution of a piston with an ellipse tube - 7 parts of the piston and reduces the effective cooling channel; in fig. 5 - the same as its cooling.

25

with external projections on the annular cooling channel tube.

The piston has a nonrisis insert 1 with a ditch 2 under the piston ring. On the inner surface of the insert 1 in the groove 3, a one-piece ringed sealed metal tube 4 with a coolant channel 5 and channels 6 (in the tube and the piston body) for its supply (and outlet) is flared.

Ring non-rigorous insert 1 is placed in the zone of the upper compression ring.

thirty

The upper 7 and lower 8 parts of the piston are connected through an annular bridge with a width K, the magnitude of which provides thermal coupling and the mechanical strength of the connection of these parts. The annular tube 4 is made by bending around the circumference with the mutual tight connection of its ends about

In the embodiment of the piston - (Fig. 2), the tube 4 is formed with the corrugations Q along the annular surface in the part of the tube covered by the material of the piston, which increases the surface of the contact of the tube with the piston 5 through 35

In the manufacture of a nonrisis insert 1, there is a groove in the inner side of it — a groove 3 in which an annular sealed metal tube 4 with a channel 5 is fixed for liquid cooling by wiring or flaring. In the nonprismatic insert 1, tube 4 can also be fixed by pressing it is tight without a groove. Then the non-resistive insert 1 with the tube 4 is alit- ally jointly as a single unit, installed in the mold, and filled to obtain the upper 7 and lower 8 parts of the piston. In the process of transferring and putting this knot into shape, it is subjected to induction heating “

After the casting of the aluminum alloy piston is obtained, the channels 6 for supplying and discharging oil are drilled therein, which supply and discharge cooling oil to the channel 5 of the cooling cavity of the upper part - the piston head and grooves 2 under the piston ring (one or more).

Offered piston design;

Increases cooling efficiency over jsepxHocTb heat transfer by improving cooling / l:

 account developed cooling surface

piston action

The tube 4 can also be made with a comb — external projections (FIG. 5) along (or across) the annular surface in the part of the tube covered by the piston material, which increases the heat transfer surface,

In an embodiment of the piston (Fig. 4), the metal tube a-4 has an elliptical (oval) cross section and is placed in the slot of the insert 1 with the major axis of the ellipse at an angle oi. to the piston axis, where oi is less than IT / 2 (i.e.

the cavity for cooling by direct contact of this cavity with the insert under the piston rings and the body of the piston.

less than 90), which provides a possibility that the proposed piston is much simpler due to the relatively low-labor-consuming one-piece metal tube, its connection in the groove (or without a tension groove) on the inner surface of the non-rim insert and the non-rim insert itself.

The invention greatly simplifies the process of obtaining from

the ability to create optimal conditions for cooling the piston, creating the necessary temperature barrier. Orpa-i reduction of the angle o /, the inclination of the major axis

with cvi

horizontal position, i.e.

n

I

The scientific research institute of the axis sharply decreases the annular jumper K and thereby weakens the mechanical strength of the connection between the upper 7 and lower 8 parts of the piston.

 FT

Increase ot angle

removes the top of the ellipse from the hot top

.. ..

7 parts of the piston and reduces its cooling efficiency.

five

0

Q

five

In the manufacture of a nonrisis insert 1, there is a groove in the inner side of it — a groove 3 in which an annular sealed metal tube 4 with a channel 5 is fixed for liquid cooling by wiring or flaring. In the nonprismatic insert 1, tube 4 can also be fixed by pressing it is tight without a groove. Then the non-resistive insert 1 with the tube 4 is alit- ally jointly as a single unit, installed in the mold, and filled to obtain the upper 7 and lower 8 parts of the piston. In the process of transferring and putting this knot into shape, it is subjected to induction heating “

After the casting of the aluminum alloy piston is obtained, the channels 6 for supplying and discharging oil are drilled therein, which supply and discharge cooling oil to the channel 5 of the cooling cavity of the upper part - the piston head and grooves 2 under the piston ring (one or more).

Offered piston design;

the cavity for cooling by direct contact of this cavity with the insert under the piston rings and the body of the piston.

In addition, the proposed piston is considerably simpler due to the relatively little laborious integral ring metal tube, its connection in the groove (or without a tension groove) on the inner surface of the nonrisis insert and the nonrisis insert itself.

The invention greatly simplifies the technological process of producing castings of pistons due to the fact that instead of the complicated process of manufacturing a cooling cavity, the pistons formed by a non-risky insert and a ring, with the implementation of taps for the output of gases, are made relatively; a simple annular sealed metal tube in a known manner (for example, a flexible tube into a ring, followed by welding the joint or soldering it with special solder). In manufacturing the proposed piston design, it is not necessary to remove gases from the tube, since during the pouring process all the gas remains inside the annular sealed metal tube. The gas pressure in this tube rises to 4-5 kgf / cm when it is poured; the tube withstands this pressure guaranteed.

Claims (4)

1. Aluminum alloy piston for an internal combustion engine, comprising a housing with an annular cooling channel and a reinforcement insert under four “O 5 0 five The upper ring located in the housing at the level of the annular cooling channel, characterized in that, in order to increase reliability by improving the cooling, the cooling channel is formed as a single annular metal tube, an annular groove is made in the reinforcement insert on the housing side, and the annular tube is placed in the latter, it is associated with an insert by flaring. 2., Piston pop. 1, which differs from the fact that the wall of the annular tube on the side of the housing is corrugated. 3. Piston POP.1, characterized in that the annular tube in cross-section is made in the form of an ellipse, the major axis of which is located at a sharp angle to the axis of the piston. 4. Piston POP.1, characterized in that the outer surface of the annular tube on the housing side is made in the form of a comb. Fi.g.5 Editor O. Bugir Compiled by V. Lobanov Tehred M. Khodanich - Proofreader S. Shekmar Order 1946/30 Circulation 504Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 g. Production and printing company, Uzhgorod, st. Project, 4