SU1687830A1 - Internal combustiom engine piston - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to engine-building and permits a reduction in the consumption of materials by the pistons of an internal combustion engine and an increase in efficiency. The piston head is made of a heat-resistant light alloy and has, in its lower part, lugs with a rounded top, with a tool for installing a connecting rod and holes for the piston pin. The piston skirt is made of ferroalloy or cermet, the thickness of the skirt walls decreases with distance from the piston head. 2 Il.

Description

The invention relates to engine building.

The purpose of the invention is to reduce material consumption and increase efficiency.

FIG. 1 shows a piston, a section along the axis of the piston pin; figure 2 - the same. cut across the axis of the piston pin.

The piston contains a head 1 with a hole under the piston pin on which the connecting rod is installed, and a skirt 2 connected to the head with grooves for compression and oil wiper rings 3. The head is made of a light alloy or a heat-resistant titanium-based alloy. The skirt is made of ferroalloy or metal ceramics.

The axis of the holes for the piston pin passes through the center of mass of the piston.

The piston of the internal combustion engine works as follows.

When the engine is operating, the pressure of gases in the cylinder is perceived by the head 1 and is transmitted through the pin to the connecting rod. At the same time, the material of the head works under more favorable conditions - pure compression.

The skirt 2 compresses the piston in the engine cylinder and directs its movement, while the skirt does not have the voltage from the gas pressure force on the piston head, which significantly reduces its deformation and reduces the gap between the skirt and the engine cylinder.

Head design eliminates the possibility of burnout. The proposed groove configuration for installing the connecting rod provides a very favorable load distribution in combination with high strength. The proposed decrease in the thickness of the skirt as it moves away from the piston head allows a lightweight, durable construction to be obtained, due to the absence of internal ribs and no stress concentrators, which results in high reliability. By reducing the weight of the piston, high rigidity and structural strength are achieved. A smaller piston-cylinder compared to traditional clearance facilitates the working conditions of piston rings,

(/

WITH

about

Xi

00

with

about

reduces the waste of oil, engine noise, increases the overhaul mileage. Thanks to r., Lchv 1 I g I to the fact that taking the surface of the skirt of the body of the rotate J into, the repair technology of the por-, ({ff- "U))) - shn. 5 h

Coordinates of the center of the ok -... with ITY,

ruzhnosti cylindrical surfaces vrt-Shh

XY planes are dependencies m 2

and the active cross-sectional area is Ho ± (0.5IB + R), skirt

0) Y ° lun R6 3 (y) (- | -) (y) 5o

where the radius of the circle is determined by the inden (s) - So,

dependencies15

where amendment 30 takes into account the reduction in carrying (asdn + Re) 2 of the total skirt capacity due to heating.

R oopptg-is + o, -0.5 (1B). Then the condition of equal skirt

2В7Г1- | И 4- | 6 ° 51В2 о.5 16). Then the condition of equal strength of the skirt

Oh has the appearance

9P

and the inner surface of the skirt is made u,. . ,

in the form of a rotating surface with decreasing mate with P Tl 7

as you move away from the head with a thickness.

according to the dependencies “R (h (

, where do you get a linear integral

x (0 r iv | eT 5 Y-t. Volterra's equation of the 2nd kind relative to the unknown function P (y), believed that

Dependencies (1) are from the geometric stress Oy are equal to the allowable Au equalities, and formula (2) is obtained from

Equations 30 p (, .- of). f 1

. Htf r

cos about

Let So be a linear function.

where H 0,5dn + R &;

cosa cos (-y) coS (/ 5- (90 ° -)) 35So (y) Ky + b,

 sin 2/3 2 sin / cos / 3 2 tg / 3 cos2 / 3 к and b are constant coefficients, and then

 2 tgP resolution P (y) can be represented as

tg2 + 140P (y)

Where

where A, B and C are constant values.

NPodstavl solution P (y) and dependence

19Р В - 6 5 f I to the original integral equation,

45 easily find a bond between A, B, C and K, b

Thus, substituting formulas for

etc D cos / J and H in the equation for R, get To tgVS; units B + -; dependence (2). Equation (3) for the inner surface of the piston skirt is determined from the condition of equal strength of all 0 Q - and ax / s cross sections of the jubhi under the action of inertial loads during operation.

engine The corresponding tension-Dependence for the curve of the inner-common tension acting in the skirt surface is found out of equality

free cross section of the skirt Y, equal to 5 urine P

p, (™ -in ,.

Ooo s (y), whence.,

where is the inertial load (Y– - (KC + b).

If y 0, then x (0) Oy / 2 then from the dependence x (y) find the coefficient b

„- (

Dib

)

The final equation for the inner surface of the piston skirt takes the form

4iJfi lVT ci cT; i

R

(CEN ,, WG Y MI h and n

(, f I

2I2 I i

and the internal riOMf (1hio ujh and -i h as the surface of the workout I m h1 shag1 as the rm of the first 1 str f h nn is removed according to

(eX

Claims (1)

where the coefficient K characterizes the intensity of the change in the thickness of the skirt. in the form of lugs characterized in that in order to reduce material consumption and increase efficiency, the lugs are made monotonously decreasing thickness in the direction to the lower edge of the skirt and coordinate The circumference of the center of a circle describing the outer surface of the bosses in a plane parallel to the axis of the piston pin is dependent on Ho yo ± (O 5IB + R), 1tsp R6 where the radius of the circle is determined by .P H where pa; aiv- zchkru1 LRNII i / nov hob, i NIS 1b - yirmine i rid t ID - MSH IMTL. (M i p ,,) oblique turn and (sinf. 1tsp pdCCTO44 l 01 M I ll I until the pinhole hole d nufijH- nro d and dp, diameter mln- sh, h, i, i, i, tr of finger B - LENGTH 1LI C. (( sk 1 surface - oi TI g g ° to thumb with bole | i and l i D external, 4 V p and hurie i h Oy VNu (PSIN 1 H Oi i lr 6l I and g on low Wed e Um .. L P. rhenium nopiijh i p i MI j of renne combustion p- DENSITY1 Ig PI I, i  Oy dopugk-1R Gchpr from the material e base Ngtgureln 1 K- KOEFITSR HE Mil T II, 11 rate of change FIG. /