DE3345766C2 - Piston ring - Google Patents

Description

20th

The invention relates to a piston ring, in particular an oil control ring with a ring with its outer surface against a running surface pressing hose spring which is held in a circumferential groove, with for A projection is used to secure against twisting of the spring relative to the groove receiving it

In such a piston ring known from DE-GM 73 12 288, the hose spring ends are over a connecting wire connected to each other, one end of which is angled to form the projection and protruding beyond, protruding into an oil slot. During assembly it can happen that the The turn jumps out of the oil slot or does not even get there, ϊο that it is in the area of the Angled to create an undesirable 1 low pressure Ring and spring come, which can damage the ring running surfaces and ring and piston seizure can lead.

From DE-OS 24 04 228 it is known to have a corrugated Use Plalt spring with angled ends, whereby one end of the flat spring in a recess in the piston groove and the other angled in the opposite direction End of the corrugated flat spring engages between the abutting ends of the piston ring to in this way to ensure the absolute position of the piston ring in relation to the piston. The piston ring assembly is here very cumbersome and time-consuming.

From DE-PS 6 63 604 it is known to use a piston ring composed of several platelets to arrange at least one projection for each of the platelets to prevent mutual twisting the platelet is prevented by elevations of a flat spring. The arrangement of the approaches and the Elevations also serve to assign and maintain the circumferential distribution of the slots in the plate.

From DE-PS 4 71 119 it is known that the quenched The ends of a piston ring are closed by a wedge piece that is connected by a flat spring the piston ring ends is pressed, the flat spring itself being connected to the wedge piece by a screw is and on the other hand is supported on the bottom of a recess in the piston This known arrangement requires a very high machining accuracy and is very sensitive to wear.

The object of the present invention is to design the piston ring mentioned at the outset in such a way that Assembly errors are largely avoidable.

To solve this problem, the invention provides that a fixedly arranged on the ring as a projection in the groove Pin, preferably a grooved pin, protrudes into a space in the spring, namely at a point on the circumference of the ring with minimal stress in an angular range of approximately 30 to 90 degrees away from the butt opening of the ring.

Due to the fixed arrangement of the pin in the ring, it is no longer necessary to pay attention during assembly, that the bend of the connecting wire engages in an oil slot in the ring Has turns finds the pen practically by itself in a space, so that a simple and Safe assembly is guaranteed by the fact that the pin at a circumferential point of the ring with minimal If there is a slight overstretching of the ring during assembly, this also occurs no permanent deformation or even a ring break, so that a high assembly quality can be achieved with little assembly effort.

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Refer to the subclaims and their advantages are explained in more detail in the description below In the drawings shows

F i g. 1 is a view of a piston ring with a hose spring,

F i g. 2 shows a scrap along the line II in FIG. 1 in larger scale.

For all relevant parts, refer to the following Description of the various exemplary embodiments, the same reference numerals are used.

The in the F i g. 1 and 2 consists of a ring (1) made of cast iron or steel and a hose spring (2) which is inserted in a circumferential groove (3). In the area of the joint opening (4) of the ring (1), the hose spring (2) is designed with a lower spring pitch and in this area can be provided with a plastic coating (5) in the form of a PTFE hose, wöbet ^; In both cases, wear in this area is largely prevented. Opposite this area, the spring (2) is designed to be open on the steep (6) Joint opening (4) removed in the ring (1) a projection (8) in the form of a grooved pin is provided, which protrudes into a space between the coils of the spring (2) and thus reliably prevents wandering in the circumferential direction of the ring (2) Provide projection (8) with a rounding (9).

Depending on the intended use, the ring (1) can have a smooth outer surface or it can have two circumferential surfaces Wear wiping edges (13), but must then be provided with oil slots (not shown) distributed around the circumference be that the stripped oil can be pumped back.

1 sheet of drawings

Claims (1)

Claim: Piston ring, in particular oil control ring, with a ring with its outer surface against a running surface pressing hose spring, which is held in a circumferential groove, v / obei to secure against Turning the tongue relative to the groove receiving it serves as a projection, characterized in that that as a projection (8) in the groove (3) a fixedly on the ring (1) arranged pin, preferably a grooved pin, protrudes into a space (11) of the spring at a circumferential point of the ring with minimal stress in an angular range (7) of about 30 to 90 ° away from the joint opening (4) of the ring.