FR2639682A1 - INTERMEDIATE TORSION RING USED IN A ROTOR PISTON SEGMENT ASSEMBLY FOR INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

The intermediate torsion ring for an internal combustion engine scraper ring assembly comprises two transverse elements, an expander element and an intermediate torsion ring which has an oblique peripheral surface 9 and, in its upper side 10 and / or lower 11, grooves 8 which drain the oil towards the crankcase. It also has on the upper or lower inner edge 13 a step 12 which makes it twist in a positive or negative direction. The expander member 5 presses the cross members against the cylinder wall to remove oil from it by scraping. The ring 3 regulates the oil consumption by its surface 9 and tightly applies, by its torsion, the elements against the groove of the piston, thus reducing the oil consumption.

Description

Intermediate torsion ring used in a segment assembly of

  The present invention relates to a scraper piston assembly for an internal combustion engine or, more particularly, to a multi-piece scraper ring comprising: two transverse elements bearing a wear-resistant coating; treated to withstand wear, a self-tensioning cast iron ring having special features interposed between the transverse members and a corrugated steel expander member engaged at the bottom of the piston groove, with the function of transversal elements for

  press them against the cylinder wall.

  Scraper segments have been known for a long time, having two transverse members in chromed steel on the peripheral wafers, a self-tensioning ring having suitable grooves and peripheral surfaces and a

  wave expander spring placed behind this ring.

  The aforementioned multi-part scraper segment is known in the piston ring and, according to the state of the art, at least since 1963, according to the Goutze catalog, publication No. 776, published

in June 1963.

  In addition to helping to scrape the oil, the intermediate ring also has the role of ensuring the supply of oil to the housing through grooves in its body and simultaneously serves as a separator between the two transverse elements. In this case, the absence of torsion effect in the intermediate ring does not allow the assembly to promote the necessary effect of lateral sealing of the transverse elements in them.

  bringing the walls closer to the groove of the piston.

  However, this effect is necessary to prevent the oil from being sucked up and burned in the combustion chamber. Therefore, one of the aims of the present invention is to ensure the sealed lateral application of the transverse elements against the groove of the piston by

  torsion movement of the intermediate ring.

  Another purpose is also to adjust the oil film formed on the wall of the cylinder to allow a good

  lubrication of the parts concerned.

  These and other aspects of the invention will be better understood by the qualified technician at

  reading the description given below in

  Referring to the accompanying drawings, in which: Figure 1 is a detail view in radial section of the aforementioned multi-piece scraper segment; Figure 2 is a front view of the intermediate ring subject of the present invention; FIGS. 3 (A) and 3 (B) are respectively front and plan views of the expander element of the multi-piece scraper segment; FIGS. 4 (A), 4 (B) and 5 (A), 5 (B) are detail views in radial section of the assembly installed for service in the piston groove, with positive twist and

inverse torsion respectively.

  The detail of the structure of the intermediate torsion ring of a multi-piece scraper segment according to the present invention is best seen in FIG. 1, which shows a cylinder wall 1 in which a back-and-forth movement piston 6 having in its periphery a scraper piston groove 4 and, therein, a multi-piece scraper ring having two transverse steel members 2, an intermediate torsion ring 3 and an expander member

corrugated 5.

  FIG. 2 shows in detail the intermediate ring 3 which comprises: an edge 7 facing the cylinder wall 1 (FIG. 1), an oblique peripheral surface 9, upper and lower faces 10, 11, and 14, an inner surface 13 and grooves 8. FIG. 3 shows at A, a top view of a side groove expander member 15 and at B, a view

in plan of this expander element.

  Figures 4 (A) and 4 (B) are detail views in radial section showing the intermediate torsion ring 3 according to the present invention placed in a piston groove with a positive-acting twist; they represent the peripheral surface of the transverse elements 2, in A, provided with a coating resistant to

  wear and, in B, with profiled edges.

  Figs. 5 (A) and 5 (B) are detail views in radial section showing the intermediate torsion ring 3 according to the present invention placed in a negative torsion-effect piston groove; they indicate the peripheral surfaces of the transverse elements 2, in A, provided with a wear-resistant coating and, in B,

having profiled edges.

  The intermediate ring according to the present invention acts as follows in use: the expander member 5 presses the transverse members 2 against the cylinder wall 1 thus scraping the oil, said oil joining the housing through the gap between piston and cylinder wall or through the grooves 8 of the intermediate ring 3 and the grooves 15 of the element

expander (Figure 3 (A)).

  The intermediate ring 3 has steps 12 or 14 which enable it to act as a torsion ring, undergoing alternating movements in service so that the transverse elements 2 act against the

  piston groove 4 to reinforce the lateral sealing.

  The step 12 can be located on the lateral face

  upper or lower of the intermediate ring 3.

  If it is located on the upper side face 10, the torsion of the intermediate ring 3 is positive, especially sealing the upper outer edge and the inner lower edge of the piston groove, as indicated by arrows on the

figure 4.

  In the case where the step 12 is located in the lower figure 11 of the ring 3, the twisting of the ring 3 is negative, establishing above all the seal on the outer lower edge and on the inner upper edge of the piston groove. , according to the arrows shown in FIG. 5. The base of the inner step 14 also ensures a positive twist of the intermediate ring 3. When this step 14 is of the Neperian type and with an oblique peripheral surface, the intermediate ring 3 also regulates the amount of oil on the cylinder wall 1, so that a film of oil remains between the ring 3 and the cylinder wall 1 to lubricate the system during the upward movement of the piston 6,

  and scrape the oil during the downward movement.

  Thus, with reference to FIG. 2, an intermediate torsion ring having either a step (12) at the upper or lower edge of its inner surface (13) or a bottom of. bench

(14) on its peripheral surface.

  FIG. 2 also shows, in the upper lateral face (10) of the intermediate torsion ring (3), grooves (8) which define with the adjacent transverse element (2) slots through which oil flows to the crankcase; of course, such grooves could be as well arranged in the lower face (11) of the ring in cooperation with the other transverse element

(2).

26396 & 2

Claims (3)

  Intermediate torsion ring used in a scraper piston ring assembly for an internal combustion engine, characterized in that it has a step (12) at the upper or lower edge of the inner surface (13) or a background of   step (14) on the peripheral surface.   2. Intermediate torsion ring used in a scraper piston ring assembly for an internal combustion engine according to claim 1, characterized in that it has on its periphery an oblique face sharp-edged (7).   Intermediate torsion ring used in a scraper piston ring assembly for an internal combustion engine according to claim 1 or 2, characterized in that it has, in its upper (10) and / or lower (11) side faces. , grooves (8) which define with one of the transverse elements (2) slots (8) through which the oil flows to the crankcase.