DE1048081B - Arrangement of one or more rings on the shaft of light metal pistons for internal combustion engines and compressors - Google Patents

Description

GERMAN

The invention relates to the arrangement of one or more rings on the shaft of light metal pistons for internal combustion engines and compressors, which are used to compensate for the game and are provided in special grooves. These rings have the property of being under when cold Maintaining the running play to wear the piston while it is in the operating state by growing of the piston skirt become ineffective. In this way it is possible to regulate the running game dominate.

The rings also take on the task of dampening noise and are therefore made of a material that can be used for this purpose, such as B. from one with a lubricant synthetic resin or silicone.

The rings in question are therefore not sealing rings in the sense of those attached to the piston head, known, usually made of metal rings, but are in special grooves provided in the shaft of the piston.

When using such plastic rings it has been found that they are likely to withstand thermal stress of the piston, but not always perfect in their thermal expansion behavior Let it be pushed back into the groove by the sliding path pressure, because sometimes the coefficient of thermal expansion require greater freedom of movement of the rings than the material of the same allows them. This deficiency is remedied according to the invention in that the damping rings have a shape elastic Training is given by placing them in the cold state on their sliding surface opposite the The cylinder wall and also only partially rest on the groove bottom of the piston. When warm the damping rings are related to the shape of the base of the annular grooves with the appropriate shape of the damping ring itself deform elastically so that it is sufficient can step back far.

The figure illustrates an example of the inventive concept. It shows a section of a piston and the associated cylinder. The groove base α of the piston b is designed in a wave-like manner. Likewise, but shifted in phase with regard to the corrugation, the sliding surface c of the damping ring d is formed. This makes it possible for the ring to deform elastically in the radial direction during operation and one within the arrangement of one or more rings

on the shaft of light alloy pistons

for internal combustion engines

and compressors

Applicant:

Karl Schmidt GmbH,
Neckarsulm (Württ.), Fabrikstr. 10

Paul Volk, Neckarsulm (Württ.),
has been named as the inventor

Ring elasticity lying suspension of the ring in the direction of the slide of the cylinder e can be effected.

Claims (3)

PATENT CLAIMS: 1. Arrangement of one or more rings on the shaft of light metal pistons for internal combustion engines and compressors, which are used to compensate for the game and are provided in special grooves, as well as for the purpose of damping made of synthetic resin provided with a lubricant or made of silicone, thereby gekenn ^. shows that these damping rings (d) in the cold state only partially rest on their sliding surface opposite the cylinder wall (e) and also on the bottom of the groove (a) of the piston (b). 2. Arrangement of one or more rings according to claim 1, characterized in that the base (a) of the groove for the damping rings (d) in the piston (b) is wave-shaped. 3. Arrangement of one or more rings according to claims 1 and 2, characterized in that the support surface (c) of the damping rings (d) opposite the cylinder wall (e) has interruptions which are opposite to the wave-like course of the groove base surface (α) in the phase are shifted. Considered publications:
U.S. Patent No. 2,462,596. 1 sheet of drawings