US1739605A - Piston - Google Patents

Description

Dec. 17, 1929. A. L. NELSON 1,739,605

PISTON Original Filed Nov. 1927 aw? f QM mwm I. I U e ADOLPK L. NELSON, OF

expansible material.

Patented Dec. 17, 1929 UNITED STATES PATENT. OFFICE DETROIT, MICHIGAN, ASSIGNOR TO IBOHN ALUMINUM & BRASS CORPORATION, OF DETROIT, MICHIGAN I'ISTON Application filed November 5, 1927, Serial 110. 281,170. Renewed January 17, 1929.

This invention relates to pistons, and particularly to pistons adapted for use in internal combustion engines.

The invention aims to provide a piston in which the lower end of the skirt will be some- What yielding but will be strong enou h to operate successfully under long periods of The piston formation of this inventionis particularly useful in connection with a pmton formed of light-weight material in wh ch the thermal expansion of the thrust-bearing portions is controlled by struts of relatively n- According to this invention the lower end of the skirt is slotted in such a way as to render it responsive to the influence of the control member and yet retain a certain required amount of stilfness.

\Vhile preferred embodiments have been illustrated for purposes of illustration, it should be understood that various changes ma be made in the structure without departin from the spirit and scope of the invention as ereinafter set forth an claimed.

In the drawings;

Fig. 1 is an elevation partly an section of a piston embodying the invention.

Fig. 2 is a section on line 2-2 of Flg. 1.

Fig. 3 is an elevation of a modified form.

Fig. 4 is a section showing a still further modification.

Referring to the drawings more particularly, the reference character 10 indicates the head of the piston, while characters 11 indicate piers depending from the head and having piston pin bosses 12 formed therein. The lower end of the skirt constitutes an annular portion 13 which is connected to the lower end of the piers 11 through horizontal arcuate webs 11 Tongues 14 and 14 extend upwardly from the annular portion 13 between the piers, and the upper ends of the tongues are spaced from the head by slots 15, and from the piers. by the vertical openings 16.

The parts already described are preferably formed of some suitable light-weight material such as aluminum alloy, and in order to control the expansion of the upper ends of the tongues 14 and 14, a air of struts 17 of some material less expansi le than the piston ma It is desirable to form the lower end of the skirt in such a manner that it will be somewhat yielding and still retain suflicient stiffness to withstand the strains of piston operation. In the present instance these results are obtained by a suitable combination of a slot or slots extending upwardly from the lower end of the skirt together with slots extending into the skirt from the lower end of the vertical openings 16.

In the piston illustration in Fi s. 1 and 2 a slot- 18 extends upwardly into t 1e tongues 14 and short slots 19extend into the skirt from the lower ends of the vertical openings 16 adjacent tongue 14. The slots 19 may be formed at any desired angle, and the slots 18 and 19 may be suitably varied in length. It will be evident that varying degrees and arrangements of skirt stiffness may be obtained by varying the lengths and positions of the slots 18 and 19.

In certain cases the best operating results may be obtained by forming the tongue 14 as well as the tongue 14 with slots 18 and 19, as illustrated in Fig. 4.

Fig. 3 shows how the slots 19 can be combined with a plurality of short slots 20. In this case the stilfness of the skirt is partly determined by the distance between the upper end of slot 20 and the opening 16 as well as b" the distance between the upper end of slot 20 and the lower end of slot 19. The tongue 14 can also be slotted in this manner.

I claim:

1. A piston comprising a head, piers depending from the head, a skirt connected to the lower ends of the piers, said skirt including a lower annular portion and tongues extending upwardly from the annular portion, the tongues being separated from the piers by openings, the skirt being formed with a slot extending into the skirt from the lower end of one of the openings, and one of the tongues being formed with a slotextirliding upwardly from the 'lower edge of the s 'rt. 1

2. A piston comprising a head, piers depending from the head, a skirt connected to the lower ends of the piers, said skirt including a lower annular portion and tongues extendlng upwardly from the annular portion, the tongues being separated from the piers by openings, the skirt being formed with slots extending into the'skirt from the lower end of two of the openings, and one of the tongues being formed with a slot extending upwardly from the lower edge of the skirt.

3. A piston comprising a head, piers de pending from the head, a skirt connected to the lower ends of the piers, said skirt includin a lower annular portion and tongues extending upwardly from the annular portion, the tongues being separated from the piers by openings, one of the tongues being formed with a slot extending upwardly from the bottom of the skirt, and the skirt being formed with a slot extending into the skirt from the lower end of each of the openings adjacent the slotted tongue.

4. A piston of light weight material comprising a head, piers depending from the head, a skirt connected to the lower ends of the piers, said skirt including a lower .annular portion and tongues extending upwardly from the annular portion on opposite sides of the piston, the tongues being separated from the head by slots and from the piers by openings, struts of relatively inexpansible materia connecting the up er ends of the-tongues, one of the tongues eing formed with a slot extending upwardly from the bottom of the skirt, and the skirt being formed with a slot extending into the skirt from the lower end of each of the openings adjacent the slotted tongue.

5. A piston of light weight material comprising a head, piers depending from the head, a skirt connected to the lower ends of the piers, said skirt including a lower annular portion and tongues extending upwardly from the annular portion on opposite sides of the iston, the tongues being sepa rated from tlie head by slots and from the piers by openings, struts of relatively inexpansible material connecting the upper ends of the ton ly from the annular portion on opposite sides of the piston, the tongues being separated from the head by slots and from the piers by es, each of the tongues being formed wit a slot extendin upwardly from.

' 1 was openings, struts of relatively inexpansible material connecting the upper ends of the ton es, one of the tongues being formed with a p urality of slots extending upwardly from the bottom of the skirt, the other tongue be ing unslotted, and the skirt being formed with a slot extending into the skirt from the lower end of each of the openings adjacent the slot-ted tongue. I

7. A piston comprising a head, piers depending from the head, a skirt connected to the lower ends of the piers, said skirt including a lower annular portion and tongues extending upwardly from the annular por tion, the tongues being separated from the piers by openings, the skirt being formed with a slot extending into the skirt from the lower end of one of the openings.

8. A piston of light weight material comprising a head, piers depending from the head, a skirt connected to the lower ends of the piers, said skirt including a lower annular portion and tongues extending upwardly from the annular portion on opposite sides of the piston, the tongues being separated from the head by slots and from the piers by openings, struts of relatively inexpansible material connecting the upper ends of the tongues, the skirt being formed with a slot extending into the skirt from the lower end of one of the openings.

In testimony whereof I aflix my signature.

ADOLPH L. NELSON.

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