JPH0743541Y2 - Structure for preventing overlapping of spacer expander of combined oil ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a structure for preventing overlapping of a spacer expander having a substantially U-shaped cross section of a combined oil ring used in an internal combustion engine.

[Conventional technology]

The combined oil ring usually has one side rail on each of the upper and lower surfaces of the spacer expander, and the spacer expander presses the side rails against the inner wall surface of the cylinder to lift up and down the lubricating oil. In order to minimize wear of the piston ring and the cylinder, an appropriate oil film is always formed on the inner wall surface of the cylinder.

A spacer expander having a substantially U-shaped cross section is known.

When installing such a spacer expander in the oil ring groove of the piston, expand the spacer expander's abutment and put it in the oil ring groove, but abut the spacer expander's abutment end in the ring groove and attach the side rail. Set it to the regular position. Then, the piston is mounted in the cylinder while closing the side rail joint.

During this operation, one abutment end of the spacer expander may get over the other abutment end and the abutment ends may overlap.

When mounted on the piston in such a state, it is impossible to apply tension to the side rail and the spacer expander does not function.

Therefore, in order to prevent such overlap of the abutment ends, the coils should be fixed to both sides of the abutment of the spacer expander by welding or the like, and the guide rods inserted therethrough should be provided across the abutment. Has proposed to use it as a guide for opening and closing the abutment (see Japanese Utility Model Laid-Open No. 64-32447).

[Problems to be solved by the device]

However, in the above, since the outer periphery of the coil is fixed by welding or the like, it has a surface with poor workability.

The present invention has been made in view of the above circumstances, and provides a structure for preventing overlapping of a spacer expander of a combined oil ring that can fix the guide member to the spacer expander by welding with good workability. The purpose is to

[Means for Solving the Problems]

According to the structure of the present invention, a pair of circumferentially extending upper and lower pieces are axially separated from each other, and their outer peripheral ends are connected by a connecting piece, and the inner circumferences of the upper and lower pieces are connected. In a spacer expander with a substantially U-shaped cross section of a combined oil ring that has a pair of upright side rail pressing pieces at its ends and has a large number of oil holes in the circumferential direction, it has a guide hole through which a guide rod is inserted. A guide member including a guide main body and a welding seat provided at an end of the guide main body so as to project outward is inserted between the upper piece and the lower piece on both sides of the gap of the spacer expander. Placed
The welding seat is welded and fixed to the inner surface of the connecting piece, and a guide rod inserted into a guide hole provided in a guide body of these guide members is provided across the abutment. To do.

[Action]

When the guide member is inserted and arranged between the upper and lower pieces of the spacer expander and the welding seat is welded and fixed to the inner surface of the connecting piece, the welding seat has a guide hole on the outer circumference of the guide body. However, since it is provided at the end portion of the guide body so as to project outward and is provided separately from the guide body, the welding operation can be easily performed, and stable welding strength can be easily obtained. Furthermore, it is possible to prevent the guide hole shape from being damaged by welding. The guide rod is mounted in a state where the guide rod is inserted into the guide holes of the guide members that are welded and fixed on both sides of the spacer expander, and the spacer expander extends over the piston expander. When assembling into the ring groove, when the abutment of the spacer expander is expanded, the guide member welded and fixed to the spacer expander moves along the guide rod, and the abutment is always guided and expanded by the guide rod. When the spacer expander is closed after it is inserted into the oil ring groove of the piston, the guide member welded and fixed to the spacer expander moves along the guide rod, and the gap is always guided by the guide rod. And the end of the abutment does not overlap,
The spacer expander returns to its original state with the abutment closed.

〔Example〕

In FIGS. 1 and 2, a spacer expander 1 has a pair of circumferentially extending upper pieces 2 and lower pieces 3 which are axially separated from each other, and their outer peripheral ends are connected by a connecting piece 4.
A pair of side rail pushing pieces 5, which stand upright at the inner edge,
It is provided with 6 and has a substantially U-shaped cross section in the axial direction.
A large number of oil holes 7 are formed in the upper piece 2, the connecting piece 4, and the lower piece 3 at equal intervals in the circumferential direction, and between the oil holes 7, the upper side rail pressing piece 5 and the upper piece are connected. A pair of facing notches 8 and 9 provided on the piece 2 and the connecting piece 4 and on the lower side rail pressing piece 6, the lower piece 3 and the connecting piece 4 are equally spaced in the circumferential direction. Many are formed.

This spacer expander 1 is formed as follows.

As shown in FIG. 3, the material 10 of the spacer expander 1
The punched steel strip that is to be formed has a large number of hexagonal oil holes 7 arranged at equal intervals in the longitudinal direction of the thin steel strip, and a pair of oil holes 7 arranged in opposition to each other in the width direction. The cutouts 8 and 9 having a substantially V shape are provided. The contour of the hexagonal oil hole 7 is composed of a pair of straight line portions 7a and 7b parallel to the longitudinal edges of the material 10 and a pair of dogleg portions 7c and 7d symmetrically arranged in the longitudinal direction. Also, a substantially V-shaped notch 8
The contour of the pair of outwardly extending C-shaped linear portions 8a, 8b arranged facing each other in the longitudinal direction, and a linear portion 8c connecting the inner end portions thereof and parallel to the longitudinal edge of the material 10. It is composed of a pair of straight line portions 8d and 8e extending from the outer ends of the pair of C-shaped straight line portions 8a and 8b to the edge perpendicular to the longitudinal edge of the material 10. The pair of V-shaped linear portions 8a and 8b are parallel to the adjacent sides of the V-shaped portions 7c and 7d of the oil hole 7. Notch 9
Has the same shape and size as the cutout portion 8, and has a pair of V-shaped linear portions 9a and 9b, a linear portion 9c parallel to the longitudinal edge of the material 10, and a longitudinal direction of the material 10. It is composed of a pair of straight line portions 9d and 9e extending perpendicularly to the edge.

The material 10 is bent 90 degrees in the same direction along a pair of bending lines AA and BB extending in the longitudinal direction to form a bending line AA.
And the connection piece 4 is formed between BB. Next, the tip portion is bent outward along the bending lines C-C and D-D to bend between the bending lines A-A and C-C, and between the bending lines B-B and D-D. The upper piece 2 and the lower piece 3 are formed, and the bending line C
The side rail pressing pieces 5 and 6 are formed at the tip end portion more than -C and the bending line DD.

The guide members 11 and 12 (see FIG. 4) are welded and fixed to both sides of the spacer expander 1 with the abutment therebetween. The guide member 11 is one in which both ends of one wire are left as welding seats 11b and 11c, and a coiled guide main body 11a is formed between them, and the welding seats 11b and 11c on both sides are Place on the same straight line. The outer diameter of the guide member 11 is smaller than the dimension between the lower surface of the upper piece 2 and the upper surface of the lower piece 3, and the inner diameter is larger than the outer diameter of the guide rod 15 (described later). , The spacer expander 1 is inserted from the inner peripheral side opening between the upper piece 2 and the lower piece 3, and one welding seat 11b is connected to the connecting piece 4 of one abutment end 13.
Spot weld it to the inner surface of the
Spot c is fixed to the inner surface of the adjacent connecting piece 4 by spot welding. The other guide member 12 also has the same shape and size as the guide member 11, and is inserted into the other abutment end portion 14 side in the same manner as the one guide member 11 and welded on both sides of the guide body 12a. The seats 12b and 12c are spot-welded to the inner surface of the connecting piece 4.

During the welding operation of the guide members 11 and 12, the welding seats 11b, 11c, 12b and 12c of the guide members 11 and 12 are coiled guide bodies 11a and 12a.
Since it is provided separately from the guide bodies 11a, 12a by projecting outward at both ends of the guide bodies 11a, 12a instead of the outer circumference of the guide bodies 11a, 12a, spot welding work can be easily performed, and
It is easy to obtain stable welding strength. Furthermore, it is possible to prevent the shape of the guide holes 16 and 17 of the coil-shaped guide bodies 11a and 12a from being damaged by welding.

The guide rod 15 has a circular cross section and is a curved round rod having substantially the same curvature as the spacer expander 1. However, the cross sectional shape thereof is not limited to a circular shape, and the guide rod 15 is curved with a curvature close to the curvature of the spacer expander 1. The better The guide rod 15 is made of a steel wire having elasticity at a high temperature, but may be made of resin or the like as long as it has heat resistance of 200 ° C. or higher, and its material is not limited. The guide rods 15 are mounted on both sides of the spacer expander 1 with the gap between the guide members 11,1.
The guide holes 16 and 17 of the second guide bodies 11a and 12a are inserted and mounted on the spacer expander 1 while straddling the abutment. Both ends of the guide rod 15 are flattened by press working, and the flattened portions 18 and 19 are locked to the guide members 11 and 12 so as not to come off from the guide members 11 and 12. In addition, as the actual work, the guide members 11, 1
After 2 is welded and fixed to the spacer expander 1, a curved round bar without flat portions 18 and 19 is passed through these guide members 11 and 12, and flat portions 18 and 19 are provided at both ends of the round rod. .

Therefore, as shown in FIG. 2, if the guide members 11 and 12 and the guide rod 15 are mounted on the spacer expander 1 as described above before the piston 20 is assembled to the piston 20, the spacer expander 1 can be attached to the oil of the piston 20. When installing the spacer expander 1 when assembling it in the ring groove 21,
Guide member 1 welded and fixed to the spacer expander 1
The guide bodies 11a, 12a of 1, 12 move along the guide rod 15, and the abutment is always guided by the guide rod 15 to expand. Then, after the spacer expander 1 is fitted in the oil ring groove 21 and the joint opening of the spacer expander 1 is closed, the guide bodies 11 of the guide members 11 and 12 welded and fixed to the spacer expander 1 are similar to the above.
a, 12a moves along the guide rod 15, the abutment is always guided by the guide rod 15, the abutment ends 13, 14 do not overlap,
The spacer expander 1 returns to the original state with the abutment closed.

In FIG. 2, 22 and 23 are side rails arranged on the upper and lower surfaces of the spacer expander 1, and 24 is a cylinder, which is the side rail pressing pieces 5 and 6 of the spacer expander 1.
The side rails 22 and 23 are pressed by the cylinder 24
Is pressed against the inner wall surface of the.

In the above example, the flat portions 18 and 19 are provided at both ends of the guide rod 15, but the present invention is not limited to this, and the flat portions 18 and 19 may be provided at other portions, for example, in the central portion of the guide rod 15. Further, in the above example, the flat portions 18, 19 are provided on the guide rod 15 as the engaging portions with the guide members 11, 12, but the engaging portions are not limited to this, and other such as bending portions and burr due to shearing. Etc. may be provided, or a heat resistant resin, a heat resistant heat shrinkable tube, a soft metal piece such as lead, etc. may be fixed.

Further, in the above example, the guide rod 15 has a length that extends over the abutment and is arranged on a part of the entire circumference of the spacer expander 1, but the length around the entire circumference of the spacer expander 1 is used. A guide rod 15 with (preferably two-thirds or more of the entire circumference) may be used. In this case, the locking portions may not be provided at both ends, but it is preferable to provide the locking portions at one end or both ends. When the locking portion is not provided, it is preferable that both ends of the guide rod 15 are arranged at positions opposite to the abutment by 180 degrees.

In addition, the guide members 11 and 12, as described above, are formed at the both end portions 13 and 14
It is preferable to provide it in the vicinity, but it may be provided in a position apart from the positions of the abutment end portions 13 and 14. However, in that case, the length of the guide rod 15 becomes long.

Further, the guide member guided by the guide rod 15 is not limited to the guide members 11 and 12 described above, and other members such as those shown in FIGS. 5 to 9 may be used.

FIG. 5 shows that the coil wire rods forming the guide main body 30a of the guide member 30 are arranged without gaps in the longitudinal direction (31 is a guide hole), and the wire rod portions forming the welding seats 30b and 30c on both sides thereof are flat. It has a crushed sectional shape.

In FIG. 6, the guide body 32a of the guide member 32 is formed of a pipe (33 is a guide hole), and one end of the flat plate welding seat 32b is fixed to the outer peripheral surface of the one end.

As shown in FIG. 7, the guide member 34 is formed by cutting out one end portion of the pipe and integrally forming a welding seat 34b having an arc-shaped cross section on one end side of a guide body 34a (35 is a guide hole) made of a pipe. It was done.

As shown in FIG. 8, the guide member 36 is formed by cutting out both end portions of the pipe, and welded seats 36b and 36c having an arc-shaped cross section are integrally formed on both end sides of the guide main body 36a (37 is a guide hole) made of a pipe. Is formed.

As shown in FIG. 9, the guide member 38 has a U-shaped central portion.
The welding seats 38b and 38c, which are bent in a U shape and extend horizontally outwardly, are formed at the upper end of the guide body 38a made of a U-shaped plate, and the guide hole 39 is formed in the facing piece of the guide body 38a. .

The above is provided with a size that can be smoothly inserted between the upper piece 2 and the lower piece 3 of the spacer expander 1, and the guide rods 31, 33, 35, 37, 39 of the respective guide holes 31, 33 are smooth. It has a hole diameter that can be inserted.

Further, the present invention is not limited to the spacer expander 1 having the above-mentioned cross-sectional shape, but other than this, as shown in FIG. 10, for example, the side rail pressing piece 5, of the spacer expander 1 having a substantially U-shaped cross-section, The tip of 6 is provided with portions 5a and 6a that are bent substantially horizontally inward, and the oil ring groove 21 is formed at these tips 5a and 6a.
For example, the back clearance with the bottom is kept constant to improve the assemblability during automatic assembly.

[Effect of device]

As described above, according to the present invention, since the guide member is welded and fixed to the spacer expander, there is no possibility that it will fall off when the piston is mounted in the oil ring groove. Further, since the welding seat is provided in the guide member separately from the guide body having the guide hole, the workability of welding to the spacer expander is good, and stable welding strength can be obtained. It's easy. Furthermore, it is possible to prevent the guide hole shape from being damaged by welding. And, it is possible to reliably prevent the abutment ends of the spacer expanders from overlapping.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view showing the vicinity of the abutment portion of a spacer expander according to an embodiment of the present invention equipped with a guide member and a guide rod, and FIG. 2 shows a side rail and the spacer expander of FIG. Sectional view of the oil ring groove portion of the incorporated piston, FIG. 3 is a plan view showing the material of the spacer expander, FIG. 4 is a perspective view of a guide member, and FIGS. 5-9 show another example of the guide member. FIG. 10 is a perspective view showing another cross-sectional shape example of the spacer expander. 1 is a spacer expander, 2 is an upper piece, 3 is a lower piece,
4 is a connecting piece, 5 and 6 are side rail pressing pieces, 7 is an oil hole, 8 and 9 are notches, 11, 12, 30, 32, 34, 36 and 38 are guide members, 11a, 12a, 30a, 32a, 34a, 36a, 38a are guide bodies, 11b, 1
1c, 12b, 12c, 30b, 30c, 32b, 34b, 36b, 36c, 38b, 38c are welding seats, 13 and 14 are abutment ends, 15 is a guide rod, 16, 17, 31, 33, 35,
37 and 39 are guide holes, 18 and 19 are locking portions, 20 is a piston, 21 is an oil ring groove, 22 and 23 are side rails, and 24 is a cylinder.

Claims (1)

[Scope of utility model registration request] 1. A pair of circumferentially extending upper and lower pieces are axially separated from each other, and their outer peripheral ends are connected by a connecting piece, and the inner peripheral ends of the upper and lower pieces are connected. In a spacer expander with a substantially U-shaped cross section of a combined oil ring that has a pair of upright side rail pressing pieces and has a large number of oil holes in the circumferential direction, a guide that has a guide hole through which a guide rod is inserted. A guide member including a main body and a welding seat provided at the end of the guide main body so as to project outward is inserted and arranged between the upper piece and the lower piece on both sides of the spacer expander. The welding seat is welded and fixed to the inner surface of the connecting piece, and guide rods inserted into the guide holes provided in the guide bodies of these guide members are provided across the abutment. Union characterized by A structure to prevent the overlapping of the spacer expander of the oil ring.