JP2012233569A - Combination oil ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sticking between side rails and the spacer expander of a combination oil ring.SOLUTION: In a combination oil ring 10, which includes a pair of top and bottom side rails 11, 12, and a spacer expander 13 disposed therebetween. The spacer expander includes: a lot of top pieces 14 and bottom pieces 15 alternately arranged in axial and circumferential directions at intervals; connecting pieces 16 connecting adjacent top and bottom pieces; and ear parts 17, 18 raised from inner circumferential side ends of the top and bottom pieces for pushing the side rails. Side rail support portions 14a, 15a projecting in an axial direction are formed in a circumferential part of the outer circumferential side ends of each of the top and bottom pieces 14 and 15. Parts 14b, 15b in the circumferential direction of the outer circumferential side ends other than the side rail support portions have one surface continuous from the inner circumferential side surface, or project to a side axially opposite the side rail support portions, and through holes 19 are formed in each of the ear parts 17, 18.

Description

  The present invention relates to a three-piece combination oil ring.

  When a three-piece combination oil ring having a pair of upper and lower side rails and a spacer expander disposed between them is used, sludge such as unburned carbon and carbon produced from the combustion product of lubricating oil is removed from the spacer. There is a tendency to deposit between the expander and the side rail. As this progresses, the side rail and the spacer expander adhere to each other due to deposits, the side rail may not follow the shape of the cylinder bore, and the predetermined performance as the oil ring may not be exhibited. On the other hand, in patent document 1, the hole of sufficient magnitude | size to pass sludge is formed in the center part of the peak part and valley part which have the substantially flat surface of an expander.

No. 2-315559

  However, in Patent Document 1, since the hole is formed in the central portion of the peak portion and the valley portion having the substantially flat surface of the expander, the expander may have insufficient rigidity.

  An object of this invention is to prevent the side rail of a combination oil ring and a spacer expander from adhering.

The present invention includes a pair of upper and lower side rails, and a spacer expander disposed between them, the spacer expander being spaced apart in the axial direction and the circumferential direction and a plurality of upper pieces arranged alternately in the circumferential direction and A lower piece, a connecting piece that connects the adjacent upper piece and the lower piece, and an ear portion that is erected at the inner peripheral side end of the upper piece and the lower piece and that presses the side rail. In combination oil ring
A side rail support portion that protrudes in the axial direction is formed in a portion of the upper piece and the lower piece in the circumferential direction on the outer circumferential side end portion, and a portion other than the side rail support portion in the circumferential direction of the outer circumferential side end portion is formed from the inner circumferential side. It has the same surface which continues, The through-hole is formed in the said ear | edge part, It is characterized by the above-mentioned.

The present invention may have the following configuration. That is, the present invention includes a pair of upper and lower side rails and a spacer expander disposed between them, and a plurality of the spacer expanders are arranged alternately in the circumferential direction and spaced apart in the axial direction and the circumferential direction. A connecting piece that connects the piece and the lower piece, the adjacent upper piece and the lower piece, and an ear portion that is formed upright at the inner peripheral side end of the upper piece and the lower piece and presses the side rail; In combination oil ring having
A side rail support portion that protrudes in the axial direction is formed at a portion of the outer end portion of the upper piece and the lower piece in the circumferential direction, and portions other than the side rail support portion in the circumferential direction of the outer end portion are the side rail support portions. It protrudes on the opposite side to the axial direction, and a through hole is formed in the ear. It is preferable that portions other than the side rail support portions in the circumferential direction of the outer peripheral side end portions of the upper and lower pieces of the spacer expander have radial through holes on the inner peripheral side thereof.

  According to the present invention, in the above, a groove is formed on at least one of the upper surface of the upper piece and the lower surface of the lower piece on the inner peripheral side of the side rail support portion of the spacer expander, and the groove is a through hole of the ear portion. It is preferable to communicate with.

  According to the present invention, the side rail support portion is formed in a part of the outer peripheral side end portion of the spacer expander in the circumferential direction, and the portions other than the side rail support portion have the same surface continuous from the inner peripheral side, or the side rail Since it protruded to the side opposite to the support portion in the axial direction, a space is formed between the spacer expander and the side rail at a portion other than the side rail support portion in the circumferential direction of the outer peripheral side end portion of the spacer expander. As a result, oil flows from the space and flows from the outer circumference side to the inner circumference side, making it easier to drain the oil containing sludge from the through hole in the ear of the spacer expander. And the spacer expander can be prevented from sticking.

It is a longitudinal cross-sectional view which shows one Embodiment of this invention, and shows the state in which the piston equipped with the combination oil ring was inserted in the cylinder. It is a perspective view which shows a part of spacer expander. It is a longitudinal cross-sectional view which shows another embodiment of this invention, and shows the state in which the piston equipped with the combination oil ring was inserted in the cylinder. It is a perspective view which shows a part of spacer expander. FIG. 6 is a longitudinal sectional view showing still another embodiment of the present invention and showing a state where a piston equipped with a combination oil ring is inserted into a cylinder. It is a perspective view which shows a part of spacer expander. It is a perspective view which shows a part of another spacer expander of this invention. It is a perspective view which shows a part of another spacer expander of this invention. It is a perspective view which shows a part of another spacer expander of this invention.

    Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, a combination oil ring 10 is mounted in an oil ring groove 4 formed on the outer peripheral surface 3 of a piston 2 in a cylinder 1. The combination oil ring 10 is a three-piece steel combination oil ring, and includes a pair of upper and lower side rails 11 and 12 and a spacer expander 13 disposed therebetween.

  The side rails 11 and 12 are plate-shaped rails having an annular shape.

  The spacer expander 13 (see FIGS. 1 and 2) is configured by a large number of periodic elements having a waveform in the axial direction in the circumferential direction. The spacer expander 13 includes a plurality of horizontal upper pieces 14 and lower pieces 15 that are spaced apart in the axial direction and the circumferential direction and arranged alternately in the circumferential direction, and the adjacent upper pieces 14 and lower pieces 15 are connected pieces 16. It is connected. Ear portions 17 and 18 for pressing the side rails 11 and 12 are formed upright at the inner peripheral side end portions of the upper piece 14 and the lower piece 15, and are formed at the root portions of the ear portions 17 and 18. Each of the through holes 19 is formed.

  The outer end portions of the upper piece 14 and the lower piece 15 have portions in the circumferential direction protruding outward in the axial direction to form support portions 14a, 15a of the side rails 11, 12. That is, a part of the outer end of the upper piece 14 in the circumferential direction protrudes upward to form the support portion 14a of the side rail 11, and a part of the outer end of the lower piece 15 protrudes downward in the circumferential direction. A support portion 15a of the side rail 12 is formed. The portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral side end portions of the upper piece 14 and the lower piece 15 have a horizontal plane continuous from the inner peripheral side.

  Therefore, the upper piece 14 and the lower piece 15 constitute a projecting surface in which a part in the circumferential direction of the outer peripheral side end part projects in the axial direction to form the side rail support parts 14a, 15a. 14b and 15b constitute a horizontal plane continuous from the inner peripheral side.

  The spacer expander 13 is mounted in the oil ring groove 4 of the piston 2 in a state in which both ends of the joint end are butted and contracted to generate a radially outward expansion force. 11 and 12 are held up and down (in the axial direction) by the side rail support portions 14a and 15a of the upper and lower pieces 14 and 15, and the upper and lower ear portions 17 and 18 press the inner peripheral surfaces of the upper and lower side rails 11 and 12, respectively. By doing so, the outer peripheral surfaces of the side rails 11 and 12 are brought into close contact with the inner wall of the cylinder 1. In this way, the outer peripheral surfaces of the upper and lower side rails 11, 12 are pressed against the inner wall of the cylinder 1, and the oil on the inner wall of the cylinder 1 is scraped off.

  As described above, the combination oil ring 10 of the present embodiment is formed by forming the side rail support portions 14a and 15a of the spacer expander 13 in a part in the circumferential direction of the outer peripheral side end portions of the upper piece 14 and the lower piece 15. In the portions 14b and 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end, between the upper piece 14 of the spacer expander 13 and the upper side rail 11, and the lower piece 15 and lower of the spacer expander 13. Spaces are formed between the side rails 12 on the side. As a result, oil flows in from these spaces and oil flows from the outer peripheral side to the inner peripheral side, and oil containing sludge can be easily discharged from the through holes 19 of the ear portions 17 and 18 of the spacer expander 13. Therefore, it is possible to prevent the side rails 11 and 12 and the spacer expander 13 from sticking to each other due to deposits.

  3 to 4 show another embodiment of the present invention. The combination oil ring 10 of the present embodiment is different from the combination oil ring of the above embodiment in the portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral side end portions of the upper piece 14 and the lower piece 15 of the spacer expander 13. The configuration is different in the following points, and the other configuration is the same as that of the above embodiment.

  Also in this embodiment, the outer peripheral side ends of the upper piece 14 and the lower piece 15 of the spacer expander 13 partially protrude in the circumferential direction to form the support portions 14a and 15a of the side rails 11 and 12. ing. That is, a part in the circumferential direction of the outer peripheral side end portion of the upper piece 14 of the spacer expander 13 protrudes upward to form a support portion 14a of the side rail 11, and a part in the circumferential direction of the outer peripheral side end portion of the lower piece 15 is A support portion 15a of the side rail 12 is formed so as to protrude downward.

  However, in the present embodiment, the portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral side ends of the upper piece 14 and the lower piece 15 of the spacer expander 13 are configured as follows. That is, the portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral end portions of the upper piece 14 and the lower piece 15 protrude on the opposite side in the axial direction from the side rail support portions 14a and 15a, and on the inner peripheral side thereof Radial through holes 20 are formed respectively. That is, the portion 14b other than the side rail support portion in the circumferential direction of the outer peripheral side end portion of the upper piece 14 of the spacer expander 13 protrudes downward and is formed one step lower than the horizontal surface portion on the inner peripheral side. A radial through hole 20 is formed on the circumferential side, and a portion 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end portion of the lower piece 15 protrudes upward and is formed one step higher than the horizontal surface portion on the inner peripheral side. And the radial direction through-hole is formed in the inner peripheral side.

  As described above, the combination oil ring 10 of the present embodiment is formed by forming the side rail support portions 14a and 15a of the spacer expander 13 in a part in the circumferential direction of the outer peripheral side end portions of the upper piece 14 and the lower piece 15. In the portions 14b and 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end, between the upper piece 14 of the spacer expander 13 and the upper side rail 11, and the lower piece 15 and lower of the spacer expander 13. Spaces are formed between the side rails 12 on the side. As a result, oil flows in from these spaces and oil flows from the outer peripheral side to the inner peripheral side, and oil containing sludge can be easily discharged from the through holes 19 of the ear portions 17 and 18 of the spacer expander 13. Therefore, it is possible to prevent the side rails 11 and 12 and the spacer expander 13 from sticking to each other due to deposits. Further, in the present embodiment, the portions 14b, 15b other than the side rail support portions protrude in the axial direction opposite to the side rail support portions 14a, 15a, and the radial through holes 20 are respectively formed on the inner peripheral side thereof. As a result, the oil passes through the portions 14 b and 15 b other than the side rail support portions and is discharged from the radial through hole 20 to the inner peripheral side, so that sludge accumulates between the spacer expander 13 and the side rails 11 and 12. It becomes difficult.

  5 to 6 show still another embodiment of the present invention. The combined oil ring 10 of this embodiment is different from the combined oil ring of the first embodiment described with reference to FIGS. 1 and 2 in that the side rail support portions 14a and 15a of the upper piece 14 and the lower piece 15 of the spacer expander 13 are the same. The configuration of the inner peripheral portion is different in the following points, and the other configurations are the same as those in the first embodiment.

  Also in this embodiment, the outer peripheral side ends of the upper piece 14 and the lower piece 15 of the spacer expander 13 partially protrude in the circumferential direction to form the support portions 14a and 15a of the side rails 11 and 12. ing. That is, a part in the circumferential direction of the outer peripheral side end portion of the upper piece 14 of the spacer expander 13 protrudes upward to form a support portion 14a of the side rail 11, and a part in the circumferential direction of the outer peripheral side end portion of the lower piece 15 is A support portion 15a of the side rail 12 is formed so as to protrude downward.

  However, in the present embodiment, the portions on the inner peripheral side of the side rail support portions 14a and 15a of the upper piece 14 and the lower piece 15 of the spacer expander 13 are configured as follows. That is, on the upper surface of the upper piece 14 of the spacer expander 13 and the lower surface of the lower piece 15, a groove 21 linearly extending in the radial direction is formed in a portion on the inner peripheral side with respect to the side rail support portion. These grooves 21 are formed by deforming predetermined portions of the upper piece 14 and the lower piece 15 into a circular arc shape by plastic working. The grooves 21 of the upper piece 14 and the lower piece 15 have inner end portions communicating with the through holes 19 at the root portions of the ear portions 17 and 18, respectively, and the outer end portions open to the outer space to form the outer space. Communicate. Reference numeral 22 denotes an opening. The cross-sectional shape of the groove 21 is an arc shape, but is not limited to this, and for example, an inverted trapezoidal shape or a V-shape is used.

  As described above, the combination oil ring 10 of the present embodiment is formed by forming the side rail support portions 14a and 15a of the spacer expander 13 in a part in the circumferential direction of the outer peripheral side end portions of the upper piece 14 and the lower piece 15. In the portions 14b and 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end, between the upper piece 14 of the spacer expander 13 and the upper side rail 11, and the lower piece 15 and lower of the spacer expander 13. Spaces are formed between the side rails 12 on the side. As a result, oil flows in from these spaces and oil flows from the outer peripheral side to the inner peripheral side, and oil containing sludge can be easily discharged from the through holes 19 of the ear portions 17 and 18 of the spacer expander 13. Therefore, it is possible to prevent the side rails 11 and 12 and the spacer expander 13 from sticking to each other due to deposits. Further, in the present embodiment, the groove 21 is formed in the upper piece 14 and the lower piece 15 of the spacer expander 13, so that the side rails 11, 12 and the spacer expander are provided at the root portions of the ear portions 17, 18. Since the size of the through hole 19 that faces the space between the spacer expander 13 and the groove 21 can be made larger than the flat case where no groove is formed, the upper and lower pieces 14 and 15 of the spacer expander 13 can be formed. And the side rails 11 and 12 are easily discharged from the through holes 19 of the ears 17 and 18 of the spacer expander 13, and the side rails 11 and 12 and the spacer expander 13 are fixed to each other by the deposits. Can be prevented. Further, the groove 21 extends in the radial direction and is not closed on the outer peripheral side, opens to the outer space and communicates with the outer space, so that the oil flows in from the opening 22 and flows from the outer peripheral side to the inner peripheral side. Therefore, it is difficult for the deposits to collect and the deposits can be easily discharged from the through holes 19 of the ear portions 17 and 18, and the side rails 11 and 12 and the spacer expander 13 are fixed to each other by the deposits. Can be further prevented.

  The structure of the groove 21 shown in the above embodiment is also applicable to the combination oil ring of the embodiment described with reference to FIGS.

  In the above embodiment, the support portions 14a and 15a of the side rail 11 formed on a part of the outer peripheral side end portions of the upper piece 14 and the lower piece 15 are both formed at the end portions in the circumferential direction. The present invention is not limited to this.

  Further, in the above embodiment, the support portions 14a and 15a of the side rail 11 formed on a part of the outer peripheral side end portions of the upper piece 14 and the lower piece 15 are end portions opposite to each other in the circumferential direction of the outer peripheral side end portion. Of course, they may be formed on the same side. In this way, the rigidity of the spacer expander 13 is increased.

  The above example is shown in FIGS.

  FIG. 7 corresponds to the first embodiment shown in FIG. 1 and FIG. 2, and the support portions 14 a and 15 a of the side rail 11 at the outer peripheral end portions of the upper piece 14 and the lower piece 15 are arranged on the same side in the circumferential direction. It is formed in the part. Other configurations are the same as those of the first embodiment shown in FIGS.

  FIG. 8 corresponds to the embodiment shown in FIGS. 3 and 4, and the support portions 14 a and 15 a of the side rail 11 at the outer peripheral side end portions of the upper piece 14 and the lower piece 15 are arranged at the end portions on the same side in the circumferential direction. Formed. Other configurations are the same as those of the embodiment shown in FIGS.

  FIG. 9 corresponds to the embodiment shown in FIGS. 5 and 6, and the support portions 14 a and 15 a of the side rails 11 at the outer peripheral side ends of the upper piece 14 and the lower piece 15 are arranged at the end portions on the same side in the circumferential direction. Formed. Other configurations are the same as those of the embodiment shown in FIGS.

  1 .... Cylinder, 2 .... Piston, 3 .... Piston outer peripheral surface, 4 .... Oil ring groove, 10 .... Combination oil ring, 11, 12 .... Side rail, 13 .... Spacer expander, 14 .... Up Piece, 15 ·· Lower piece, 14a, 15a ·· Side rail support portion, 14b, 15b ·· Parts other than side rail support portion, 16 ·· Connection piece, 17, 18 ·· Ear portion, 19 ·· Through hole 20 through holes, 21 through grooves, 22 openings.

  The present invention relates to a three-piece combination oil ring.

  When a three-piece combination oil ring having a pair of upper and lower side rails and a spacer expander disposed between them is used, sludge such as unburned carbon and carbon produced from the combustion product of lubricating oil is removed from the spacer. There is a tendency to deposit between the expander and the side rail. As this progresses, the side rail and the spacer expander adhere to each other due to deposits, the side rail may not follow the shape of the cylinder bore, and the predetermined performance as the oil ring may not be exhibited. On the other hand, in patent document 1, the hole of sufficient magnitude | size to pass sludge is formed in the center part of the peak part and valley part which have the substantially flat surface of an expander.

No. 2-315559

  However, in Patent Document 1, since the hole is formed in the central portion of the peak portion and the valley portion having the substantially flat surface of the expander, the expander may have insufficient rigidity.

  An object of this invention is to prevent the side rail of a combination oil ring and a spacer expander from adhering.

The present invention includes a pair of upper and lower side rails, and a spacer expander disposed between them, the spacer expander being spaced apart in the axial direction and the circumferential direction and a plurality of upper pieces arranged alternately in the circumferential direction and A lower piece, a connecting piece that connects the adjacent upper piece and the lower piece, and an ear portion that is erected at the inner peripheral side end of the upper piece and the lower piece and that presses the side rail. In the combination oil ring in which a through hole is formed in the ear part ,
Wherein the side rail support parts projecting said upper piece and axially on a part including the end or ends in the circumferential direction of the outer end portion of the lower piece are formed.

  According to the present invention, in the above, a groove is formed on at least one of the upper surface of the upper piece and the lower surface of the lower piece on the inner peripheral side of the side rail support portion of the spacer expander, and the groove is a through hole of the ear portion. It is preferable to communicate with.

According to the present invention, than to form side rail support parts to a portion including the end or ends in the circumferential direction of the outer end portion of the spacer expander, the circumferential direction of the outer end portion of the scan pacer expander A space is formed between the spacer expander and the side rail at a portion other than the side rail support portion. As a result, oil flows from the space and flows from the outer circumference side to the inner circumference side, making it easier to drain the oil containing sludge from the through hole in the ear of the spacer expander. And the spacer expander can be prevented from sticking.

It is a longitudinal cross-sectional view which shows one Embodiment of this invention, and shows the state in which the piston equipped with the combination oil ring was inserted in the cylinder. It is a perspective view which shows a part of spacer expander. It is a longitudinal cross-sectional view which shows another embodiment of this invention, and shows the state in which the piston equipped with the combination oil ring was inserted in the cylinder. It is a perspective view which shows a part of spacer expander. FIG. 6 is a longitudinal sectional view showing still another embodiment of the present invention and showing a state where a piston equipped with a combination oil ring is inserted into a cylinder. It is a perspective view which shows a part of spacer expander. It is a perspective view which shows a part of another spacer expander of this invention. It is a perspective view which shows a part of another spacer expander of this invention. It is a perspective view which shows a part of another spacer expander of this invention.

    Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, a combination oil ring 10 is mounted in an oil ring groove 4 formed on the outer peripheral surface 3 of a piston 2 in a cylinder 1. The combination oil ring 10 is a three-piece steel combination oil ring, and includes a pair of upper and lower side rails 11 and 12 and a spacer expander 13 disposed therebetween.

  The side rails 11 and 12 are plate-shaped rails having an annular shape.

  The spacer expander 13 (see FIGS. 1 and 2) is configured by a large number of periodic elements having a waveform in the axial direction in the circumferential direction. The spacer expander 13 includes a plurality of horizontal upper pieces 14 and lower pieces 15 that are spaced apart in the axial direction and the circumferential direction and arranged alternately in the circumferential direction, and the adjacent upper pieces 14 and lower pieces 15 are connected pieces 16. It is connected. Ear portions 17 and 18 for pressing the side rails 11 and 12 are formed upright at the inner peripheral side end portions of the upper piece 14 and the lower piece 15, and are formed at the root portions of the ear portions 17 and 18. Each of the through holes 19 is formed.

The outer peripheral end of the top pieces 14 and bottom pieces 15, one end portion in the circumferential direction forms a supporting portion 14a, 15a of the side rails 11 and 12 projecting axially outward. Ie one end in the circumferential direction of the outer end portion of the upper piece 14 forms a support portion 14a of the side rails 11 protrude upward, one end portion in the circumferential direction of the outer end portion of the lower piece 15 below The support part 15a of the side rail 12 is formed projecting to the side. The portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral side end portions of the upper piece 14 and the lower piece 15 have a horizontal plane continuous from the inner peripheral side.

Thus, the upper piece 14 and the lower piece 15, the side rail support parts 14a one end portion in the circumferential direction of the outer end portion protrudes in the axial direction, and constitute the protruding surface for forming a 15a, the other part (the side The portions other than the rail support portions 14b and 15b constitute a horizontal plane continuous from the inner peripheral side.

  The spacer expander 13 is mounted in the oil ring groove 4 of the piston 2 in a state in which both ends of the joint end are butted and contracted to generate a radially outward expansion force. 11 and 12 are held up and down (in the axial direction) by the side rail support portions 14a and 15a of the upper and lower pieces 14 and 15, and the upper and lower ear portions 17 and 18 press the inner peripheral surfaces of the upper and lower side rails 11 and 12, respectively. By doing so, the outer peripheral surfaces of the side rails 11 and 12 are brought into close contact with the inner wall of the cylinder 1. In this way, the outer peripheral surfaces of the upper and lower side rails 11, 12 are pressed against the inner wall of the cylinder 1, and the oil on the inner wall of the cylinder 1 is scraped off.

The combination oil ring 10 of the present embodiment as is described above, the side rail support parts 14a of the spacer expander 13, the 15a, is formed in one end portion in the circumferential direction of the outer end portion of the top pieces 14 and bottom pieces 15 Thus, the portions 14b and 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end portion are arranged between the upper piece 14 of the spacer expander 13 and the upper side rail 11 and the lower piece 15 of the spacer expander 13. A space is formed between the lower side rail 12 and the lower side rail 12. As a result, oil flows in from these spaces and oil flows from the outer peripheral side to the inner peripheral side, and oil containing sludge can be easily discharged from the through holes 19 of the ear portions 17 and 18 of the spacer expander 13. Therefore, it is possible to prevent the side rails 11 and 12 and the spacer expander 13 from sticking to each other due to deposits.

  3 to 4 show another embodiment of the present invention. The combination oil ring 10 of the present embodiment is different from the combination oil ring of the above embodiment in the portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral side end portions of the upper piece 14 and the lower piece 15 of the spacer expander 13. The configuration is different in the following points, and the other configuration is the same as that of the above embodiment.

In this embodiment, the outer peripheral end of the upper piece 14 and the lower piece 15 of the spacer expander 13, the support portion 14a of the side rails 11, 12 one end portion in the circumferential direction protrudes axially outward, the 15a Forming. Ie one end in the circumferential direction of the outer end portion of the upper piece 14 of the spacer expander 13 to form a support portion 14a of the side rails 11 protrude upward, in the circumferential direction of the outer end portion of the lower piece 15 one end forms a supporting portion 15a of the side rail 12 and projects downward.

  However, in the present embodiment, the portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral side ends of the upper piece 14 and the lower piece 15 of the spacer expander 13 are configured as follows. That is, the portions 14b and 15b other than the side rail support portions in the circumferential direction of the outer peripheral end portions of the upper piece 14 and the lower piece 15 protrude on the opposite side in the axial direction from the side rail support portions 14a and 15a, and on the inner peripheral side thereof Radial through holes 20 are formed respectively. That is, the portion 14b other than the side rail support portion in the circumferential direction of the outer peripheral side end portion of the upper piece 14 of the spacer expander 13 protrudes downward and is formed one step lower than the horizontal surface portion on the inner peripheral side. A radial through hole 20 is formed on the circumferential side, and a portion 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end portion of the lower piece 15 protrudes upward and is formed one step higher than the horizontal surface portion on the inner peripheral side. And the radial direction through-hole is formed in the inner peripheral side.

The combination oil ring 10 of the present embodiment as is described above, the side rail support parts 14a of the spacer expander 13, the 15a, is formed in one end portion in the circumferential direction of the outer end portion of the top pieces 14 and bottom pieces 15 Thus, the portions 14b and 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end portion are arranged between the upper piece 14 of the spacer expander 13 and the upper side rail 11 and the lower piece 15 of the spacer expander 13. A space is formed between the lower side rail 12 and the lower side rail 12. As a result, oil flows in from these spaces and oil flows from the outer peripheral side to the inner peripheral side, and oil containing sludge can be easily discharged from the through holes 19 of the ear portions 17 and 18 of the spacer expander 13. Therefore, it is possible to prevent the side rails 11 and 12 and the spacer expander 13 from sticking to each other due to deposits. Further, in the present embodiment, the portions 14b, 15b other than the side rail support portions protrude in the axial direction opposite to the side rail support portions 14a, 15a, and the radial through holes 20 are respectively formed on the inner peripheral side thereof. As a result, the oil passes through the portions 14 b and 15 b other than the side rail support portions and is discharged from the radial through hole 20 to the inner peripheral side, so that sludge accumulates between the spacer expander 13 and the side rails 11 and 12. It becomes difficult.

  5 to 6 show still another embodiment of the present invention. The combined oil ring 10 of this embodiment is different from the combined oil ring of the first embodiment described with reference to FIGS. 1 and 2 in that the side rail support portions 14a and 15a of the upper piece 14 and the lower piece 15 of the spacer expander 13 are the same. The configuration of the inner peripheral portion is different in the following points, and the other configurations are the same as those in the first embodiment.

In this embodiment, the outer peripheral end of the upper piece 14 and the lower piece 15 of the spacer expander 13, the support portion 14a of the side rails 11, 12 one end portion in the circumferential direction protrudes axially outward, the 15a Forming. Ie one end in the circumferential direction of the outer end portion of the upper piece 14 of the spacer expander 13 to form a support portion 14a of the side rails 11 protrude upward, in the circumferential direction of the outer end portion of the lower piece 15 one end forms a supporting portion 15a of the side rail 12 and projects downward.

  However, in the present embodiment, the portions on the inner peripheral side of the side rail support portions 14a and 15a of the upper piece 14 and the lower piece 15 of the spacer expander 13 are configured as follows. That is, on the upper surface of the upper piece 14 of the spacer expander 13 and the lower surface of the lower piece 15, a groove 21 linearly extending in the radial direction is formed in a portion on the inner peripheral side with respect to the side rail support portion. These grooves 21 are formed by deforming predetermined portions of the upper piece 14 and the lower piece 15 into a circular arc shape by plastic working. The grooves 21 of the upper piece 14 and the lower piece 15 have inner end portions communicating with the through holes 19 at the root portions of the ear portions 17 and 18, respectively, and the outer end portions open to the outer space to form the outer space. Communicate. Reference numeral 22 denotes an opening. The cross-sectional shape of the groove 21 is an arc shape, but is not limited to this, and for example, an inverted trapezoidal shape or a V-shape is used.

The combination oil ring 10 of the present embodiment as is described above, the side rail support parts 14a of the spacer expander 13, the 15a, is formed in one end portion in the circumferential direction of the outer end portion of the top pieces 14 and bottom pieces 15 Thus, the portions 14b and 15b other than the side rail support portion in the circumferential direction of the outer peripheral side end portion are arranged between the upper piece 14 of the spacer expander 13 and the upper side rail 11 and the lower piece 15 of the spacer expander 13. A space is formed between the lower side rail 12 and the lower side rail 12. As a result, oil flows in from these spaces and oil flows from the outer peripheral side to the inner peripheral side, and oil containing sludge can be easily discharged from the through holes 19 of the ear portions 17 and 18 of the spacer expander 13. Therefore, it is possible to prevent the side rails 11 and 12 and the spacer expander 13 from sticking to each other due to deposits. Further, in the present embodiment, the groove 21 is formed in the upper piece 14 and the lower piece 15 of the spacer expander 13, so that the side rails 11, 12 and the spacer expander are provided at the root portions of the ear portions 17, 18. Since the size of the through hole 19 that faces the space between the spacer expander 13 and the groove 21 can be made larger than the flat case where no groove is formed, the upper and lower pieces 14 and 15 of the spacer expander 13 can be formed. And the side rails 11 and 12 are easily discharged from the through holes 19 of the ears 17 and 18 of the spacer expander 13, and the side rails 11 and 12 and the spacer expander 13 are fixed to each other by the deposits. Can be prevented. Further, the groove 21 extends in the radial direction and is not closed on the outer peripheral side, opens to the outer space and communicates with the outer space, so that the oil flows in from the opening 22 and flows from the outer peripheral side to the inner peripheral side. Therefore, it is difficult for the deposits to collect and the deposits can be easily discharged from the through holes 19 of the ear portions 17 and 18, and the side rails 11 and 12 and the spacer expander 13 are fixed to each other by the deposits. Can be further prevented.

  The structure of the groove 21 shown in the above embodiment is also applicable to the combination oil ring of the embodiment described with reference to FIGS.

In the above embodiments, top pieces 14 and Saidore Le supporting lifting portion 14a formed at one end portion in the circumferential direction of the outer end portion of the lower piece 15, 15a has opposite sides in the circumferential direction of the outer end portion Of course, they may be formed on the same side. In this way, the rigidity of the spacer expander 13 is increased.

  The above example is shown in FIGS.

7 corresponds to the first embodiment shown in FIGS. 1 and 2, top pieces 14 and the same end outer peripheral side end portion of the Saidore Le supporting lifting unit 14a, a 15a in the circumferential direction of the bottom pieces 15 Is formed. Other configurations are the same as those of the first embodiment shown in FIGS.

8 corresponds to the embodiment shown in FIGS. 3 and 4, top pieces 14 and the outer peripheral end of the Saidore Le supporting lifting portion 14a of the lower piece 15, formed at the same end in the 15a circumferentially It is a thing. Other configurations are the same as those of the embodiment shown in FIGS.

9 corresponds to the embodiment shown in FIGS. 5 and 6, top pieces 14 and the outer peripheral end of the Saidore Le supporting lifting portion 14a of the lower piece 15, formed at the same end in the 15a circumferentially It is a thing. Other configurations are the same as those of the embodiment shown in FIGS.

  1 .... Cylinder, 2 .... Piston, 3 .... Piston outer peripheral surface, 4 .... Oil ring groove, 10 .... Combination oil ring, 11, 12 .... Side rail, 13 .... Spacer expander, 14 .... Up Piece, 15 ·· Lower piece, 14a, 15a ·· Side rail support portion, 14b, 15b ·· Parts other than side rail support portion, 16 ·· Connection piece, 17, 18 ·· Ear portion, 19 ·· Through hole 20 through holes, 21 through grooves, 22 openings.

Claims (4)

A pair of upper and lower side rails, and a spacer expander disposed between them, the spacer expander being spaced apart in the axial direction and the circumferential direction, and a plurality of upper pieces and lower pieces arranged alternately in the circumferential direction; A combination having a connecting piece connecting adjacent upper pieces and a lower piece, and an ear portion standing on the inner peripheral side of the upper piece and the lower piece and for pressing the side rail In the oil ring,
A side rail support portion that protrudes in the axial direction is formed in a portion of the upper piece and the lower piece in the circumferential direction on the outer circumferential side end portion, and a portion other than the side rail support portion in the circumferential direction of the outer circumferential side end portion is formed from the inner circumferential side. A combined oil ring having continuous surfaces and a through-hole formed in the ear. A pair of upper and lower side rails, and a spacer expander disposed between them, the spacer expander being spaced apart in the axial direction and the circumferential direction, and a plurality of upper pieces and lower pieces arranged alternately in the circumferential direction; A combination having a connecting piece connecting adjacent upper pieces and a lower piece, and an ear portion standing on the inner peripheral side of the upper piece and the lower piece and for pressing the side rail In the oil ring,
A side rail support portion that protrudes in the axial direction is formed at a portion of the outer end portion of the upper piece and the lower piece in the circumferential direction, and portions other than the side rail support portion in the circumferential direction of the outer end portion are the side rail support portions. The combination oil ring is characterized in that it protrudes in the axial direction opposite to the part and a through hole is formed in the ear part.   The portion other than the side rail support portion in the circumferential direction of the outer peripheral side end portions of the upper and lower pieces of the spacer expander has a radial through hole on the inner peripheral side thereof. Combination oil ring.   A groove is formed on at least one of the upper surface of the upper piece and the lower surface of the lower piece on the inner peripheral side of the side rail support portion of the spacer expander, and the groove communicates with the through hole of the ear portion. The combined oil ring according to claim 1, 2, or 3.

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