JPS6027801Y2 - Spacer expander for piston rings - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spacer expander for piston rings used in internal combustion engines.

Conventional piston ring spacer expanders used in internal combustion engines generally have a sight rail R at the inner free end of the upper and lower flanges a, which are bent in a U-shaped cross section and arranged in a row as shown in Figures 1 and 2. A piston ring spacer expander A is used which has a pressing protrusion of 1, a connecting part C connecting adjacent upper and lower flanges arranged in a row on the outer circumferential side, and an abutment part d. When a spacer expander is attached to the ring iQ of the piston P in combination with the sight rail R, the abutment portions d of the spacer expander often overlap in the radial direction, and in this state, the upper and lower sight rails R If these are combined, the sight rail will not be joined to the upper and lower surfaces of the spacer expander over its entire circumference, and only the overlapping portion will protrude toward the outer circumference, making it impossible to insert it into the cylinder S.

If the oil ring happens to be in such a state and it is forcefully inserted into the cylinder, the sliding surface of the sight rail with the cylinder inner circumferential surface will not be evenly pressed against the cylinder inner circumferential surface all around, and therefore the oil ring will not be able to perform its original function. In addition, the projecting portion of the sight rail exerts an abnormally strong pressure on the inner circumferential surface of the cylinder, cutting the oil film and causing seizure accidents.

The present invention has been made to solve this problem, and is designed to prevent the abutting portions of the spacer expanders from overlapping.

Next, to explain the embodiment shown in the drawings, reference numeral 1 denotes a spacer expander, and the spacer expander 1 has each free end on the inner peripheral side of upper and lower flanges 2, 2, which are bent and arranged in a U-shaped cross section. A pressing protrusion 4 of the sight rail R is provided on the portion 3, and connecting portions 5 for connecting the upper and lower flanges 2, 2 that are adjacent to each other are arranged in a row on the outer circumferential side, and an abutment portion 6 is provided.

On one side 6' of the abutment part 6 of the spacer expander 1, there are upper and lower flanges 2 bent in a U-shaped cross section.
, 2, a guide rod 7 extending in the circumferential direction is provided by stamping or the like so as to be located slightly inside the upright connecting portion 5, and the other side 6'' of the abutting portion 6 is provided with a guide rod 7 that extends in the circumferential direction. Upright connecting portions 5 connecting the upper and lower flanges 2, 2 bent in a U-shaped cross section and connecting portions 5' having bent portions 8 bent inward in the radial direction are alternately provided, and the upright connecting portions and A guide rod extending in the circumferential direction is inserted between the bending portion of the connecting portion having the bending portion, so that both of the abutment portions 6 of the spacer expander 1 are expanded or contracted along the guide rod. In this case, there is no overlap in the radial direction.

9 indicates the oil hole of the piston.

The length of the guide rod is the same when the spacer expander is expanded to fit into the piston ring groove of the piston.
The length of the guide rod required for assembling each connecting part is required, and generally it is sufficient to be about 10 to 15 times the depth of the piston ring groove, but in some cases it may be provided over almost the entire circumference of the spacer extractor bank. It's okay.

In this case, when the upright connecting part 5 and the connecting part 5' having the bent part 8 are retracted along the guide rod 7, the tip of one end of the connecting part 6' will collide. The spacer expanders are provided alternately over substantially the entire circumference of the spacer expander so as not to overlap each other.

In the present invention configured as described above, the press protrusion 4 of the sight rail provided at the inner free end of the upper and lower flanges 2 of the spacer expander 1 is placed inside the upper and lower flanges adjacent to each other. With the connection part 5 on the outer circumference side as the outer circumference,
The spacer extractor is fitted into the ring IQ of the piston P so that the pressing protrusion 4 under the soil container presses the sight rail R against the inner peripheral surface of the cylinder and the upper and lower side walls of the piston ring groove. One side 6 of the joint part of panda 1
A guide rod 7 extending in the circumferential direction is provided on the upright connecting portion 5 which is bent to have a U-shaped cross section and connects the upper and lower flanges, and a guide rod 7 extending in the circumferential direction is provided at the other end 6'' of the abutment portion. An upright connecting part 5 that is bent into a shape and connects the upper and lower flanges.
and a connecting portion 5 having a bent portion 8 that bends inward in the radial direction.
′ are provided alternately, and the guide rod 7 extending in the circumferential direction is inserted between the upright connecting portion and the bent portion of the connecting portion having a bent portion to prevent movement in the circumferential direction or falling off. Therefore, the abutment part 6 of the spacer expand expands and contracts along its guide rod, and the abutment parts never overlap each other in the radial direction, keeping the sight rail in its normal state. The spacer expander has a U-shaped cross section, allowing the lubricating oil to be ideally scraped down, without the risk of scratching the inner circumferential surface of the cylinder, and because the spacer expander has a U-shaped cross section, Since the guide rod can be provided protruding from the connecting part of the flange, the abutment part of the spacer expander can be guided by the guide rod without providing an engaging part with the spacer expander bank at both ends of the guide rod. In addition, the guide rod can be smoothly guided by bending the guide rod without penetrating the through hole of the guide rod into the connecting portion of the spacer expander, so that the expansion and contraction strength of the spacer expander is not reduced. This has excellent effects such as being able to improve durability.

[Brief explanation of the drawing]

Fig. 1 is a partially enlarged perspective view of a conventionally known spacer expander for piston rings, Fig. 2 is an enlarged sectional view of the spacer expander of Fig. 1 installed in the piston ring groove together with the upper and lower sight rails, and Fig. 2 is an enlarged sectional view of the spacer expander of Fig. FIG. 3 is a partially enlarged perspective view of the spacer expander of the present invention. 1... Spacer expander, 2...
Flange, 4...Press protrusion, 5...
Upright connecting part, 5'...connecting part having a bent part,
6... Joint part, 7... Guide rod, 8
・・・・・・Bending part.

Claims (1)

[Scope of utility model registration request] A pressing protrusion of the sight rail is provided at each free end on the inner peripheral side of the upper and lower flanges arranged bent in a U-shaped cross section, and
In a spacer expander for a piston ring, in which connecting parts connecting upper and lower flanges that are adjacent to each other are arranged in a row on the outer circumferential side and having an abutment part, one of the abutment parts has an upper and lower part bent in a U-shaped cross section. A guide rod extending in the circumferential direction is provided protruding from an upright connecting part that connects the flanges, and an upright connecting part that is bent to have a U-shaped cross section and connects the upper and lower flanges on the other side of the abutment part; Connecting portions having bent portions bent inward in the radial direction are alternately provided, and the guide rod extending in the circumferential direction is inserted between the upright connecting portions and the bent portion of the connecting portion having the bent portion. This is a spacer expander for piston rings.