JPS5928050A - Reciprocating internal combustion engine with split piston ring - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a piston ring transverse to the piston ring axis which communicates with the piston ring side closer to the cylinder spatula r by at least one duct extending transversely to the circumferential direction. The present invention relates to a reciprocating internal combustion engine having a split piston ring having an extending groove formed in its running surface, and a cylinder running surface having a lubricating orifice formed therein.

Internal combustion engines with rings of the type described above are well known. For example, the 8th edition of Kotzber's "Engineer's Deck for Piston Rings, Seal Rings, and Machine Shaft Seals"
on page 55 describes a piston ring formed with a circumferential groove extending perpendicular to the piston ring axis and having a duct parallel to the axis.

However, a drawback of such prior art is that when the gas flow enters the circumferential groove, it has to bend in a mechanically unfavorable manner, which causes the mechanical energy of the gas flow to be lost in multiple bolts. The distribution of oil along the lines may be particularly poor. As a result, the circumferential oil distribution and cleaning of the circumferential grooves is insufficient, so that combustion residues accumulate in the grooves and the grooves quickly become clogged. Another drawback is that in conventional piston rings, the circumferential direction <
It is not possible to determine the position of the piston ring relative to the sb piston or to detect the state of wear of the piston ring.

It is an object of the present invention to substantially improve the circumferential oil distribution of the piston rings, and thus to improve their alignment, in reciprocating internal combustion engines of the kind mentioned above, and to improve the position and wear of the piston rings. The objective is to provide an engine that enables detection.

Therefore, according to the present invention, the monument extends as a continuous spiral over the entire circumference of the piston ring.

When the piston ring passes over the lubrication bore, the gas pressure creates a flow of oil in the helical groove in the circumferential direction and axial direction of the piston ring, thereby only distributing the oil in the circumferential direction. Instead, the piston ring groove is sufficiently cleaned to remove the M tag material and combustion residue.

Further, the spiral groove is described in German Patent Specification No. 2,517,7.
As described in No. 51, it becomes a means for knowing the position and wear state of the piston rings. However, because the conventional grooves are filled with non-magnetic solid particles, they cannot be used for lubrication purposes in the present invention.

Very suitably, the duct communicating with the groove can be rolled diagonally with respect to the circumferential direction. With such features, a gas flow acts in the direction of oil flow in the groove, accelerating the oil flow, and a vortex effect is additionally created with a predetermined slope. Significantly improves oil distribution within a specific circumferential direction.

The groove can have a cross section whose width increases with increasing distance from the running surface of the piston ring.

This simple feature aids in detecting wear on piston ring running surfaces in a known manner.

The cross section of the groove can be triangular. This feature greatly facilitates the oil storage performance of the groove.

The bottom flank of γh extends perpendicularly to the running surface of the piston ring. This feature makes determining the position or rotational position of the piston rings very easy.

Also, the groove system of the piston ring of the present invention can cooperate with a bore-shaped hook slide orifice in the cylinder running surface. This feature greatly simplifies the supply of lubricating oil to the cylinder.

Next, the present invention will be described in more detail with reference to embodiments shown in the accompanying drawings.

As is well known, the cylinder liner 1o of a two-stroke diesel engine for ships, as shown in FIG. The piston 22 moving within the liner 10 is provided with a piston ring 26 in a piston ring groove provided in the top portion 24 of the piston 22 and a circumferential It receives helically grooved formed piston rings 28 and 30. The top portion 24 leads to a bottom portion 32 which encloses a substantially cylindrical outer surface of an outer diameter smaller than the outer diameter of the top portion 24. Piston 22 is not shown. Introduced as piston ring.

Its sacral end is pivoted to a crosshead (not shown) in a known manner.

The piston ring 28 (FIGS. 2 and 6) has a striking surface 34 that meets the cylinder liner wall 16, as well as a latch to create elasticity and press the surface 34 against the cylinder wall 16, as is well known. It has a division of 18 that allows it to be suppressed.

According to the invention, the piston ring 28 has a groove 36 extending as a continuous helical groove on the circumference of this Cstone ring.
40', which is formed with a circumferential inclination, opens into #36, and extends at an angle α to the top surface 42 of the ring or to the circumferential direction.
? :[do. Preferably the angle α is greater than about 60°, but 9
It is made smaller than 0°.

The gas-tight piston ring 30 shown in FIGS. 4 and 5 is used as a latch 44, for example in
, 954, having interengaging members or fingers 46, 48 and the like at the ring ends. In this case, the helical groove 50 terminates before the latch 44 and a duct 52 opens into the helical groove 50 extending perpendicularly to the top surface 42, ie, to the circumferential direction.

As an example of engine operation 44M, consider when gas pressure is moving piston 22 from its top dead center position toward the crankshaft. A lubrication bore 20, shown schematically in FIG. 4, intersects with a groove 50. Gas flows through duct 52 and groove 50 in the direction indicated by arrow 54. Gas flows through the lubrication bore 20 in the direction indicated by arrow 56 and accelerates the flow of lubrication oil through the groove 50. The gas flow also cleans or removes debris from the circumference rl#50 as indicated by arrow 58. duct 40
．． 52 also serves to equalize the pressure at each 436,50.

As shown in FIG. 5, the bottom flank 60 of the hook 50 extends at right angles to the running surface 34 of the piston ring 300.

The distance to the bottom 4 surface 62 of the piston ring 30 is indicated by the position 4r of the piston ring 30 on the piston 22 in the circumferential direction. Furthermore, the degree of wear on the surface 34 can be determined by measuring the width B.

duct) 40.52 can of course be bored to at least the extent of.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a cylinder of a reciprocating internal combustion engine in which a piston with a piston ring is installed; FIG. 2 is an enlarged view of one of the piston rings shown in FIG. Fig. 6 is a plan view corresponding to Fig. 2, Fig. 4 is a drawing similar to the m2 drawing of the gas-tight piston ring, and Fig. 5 is a plan view of the ring. FIG. 4 is a sectional view taken along line v-■ in FIG. 4; DESCRIPTION OF SYMBOLS 10... Engine cylinder liner, 16... Same inner wall, 20... Lubrication bore, 22... Piston, 28
．． 30... Piston ring with spiral groove, 34... Same running surface, 36.50... Spiral groove, 38... Split, 4
0.52...Duct, 42...Piston ring top end surface, 44...Latch, 46.48 River finger, 54
．． 56.58...Gas flow, 60...Bottom flank of groove, 62...Bottom end surface of piston ring.

Claims (1)

[Claims] (1) At least one extending in a direction transverse to the circumferential direction
A split piston ring with a groove formed in its running surface extending transversely to the piston ring axis, communicating with the piston ring side closer to the cylinder head by two ducts, and a cylinder with a lubricating orifice formed therein. In a reciprocating internal combustion engine having a running surface, the groove (36
, 50) extends as a continuous spiral over the entire circumference of the piston ring (2El, 30). (2. The engine according to claim 1, wherein the 5 (the duct communicating with 36J) (40) is an oblique rolling column with respect to the circumferential direction. (3) The engine according to claim 1. In the engine of range 1, the groove (36, 50) is connected to the piston ring (28, 30).
) having a cross section with a width (B) that increases with increasing distance from the running surface (34). (4) The engine according to claim 1, wherein the M plane of the groove is triangular. (5) In the engine according to claim 1, the bottom flank (60) of the groove is connected to the piston ring (28,
An engine characterized in that it extends at right angles to said running surface (34) of 307. (6) An engine according to claim 1, characterized in that said groove (36, 50) cooperates with a bore-shaped lubrication orifice (20) in said cylinder running surface (16).