JPH0721965Y2 - 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 that it should serve as a guide for opening and closing the abutment (see No. 32-32447, Shokai).

[Problems to be solved by the device]

However, if the coil is fixed by the above welding, etc.,
The mounting may change the characteristics of the spacer expander.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a structure for preventing the overlapping of the spacer expander of the combination oil ring that can prevent the overlapping of the spacer without changing the characteristics of the spacer expander. To do.

[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. A pair of upright side rail pressing pieces are provided at the ends, a large number of oil holes are provided in the circumferential direction, and a pair of opposed notches extending radially from the tips of the pair of side rail pressing pieces are provided between these oil holes. In a spacer expander having a substantially U-shaped cross section of a combined oil ring having a large number of parts in the circumferential direction, on both sides sandwiching the abutment of the spacer expander, from both ends of the part sandwiched by the pair of facing notches A pair of guide pieces extending in one direction and bent in the other direction are provided, and a guide rod that penetrates between these guide pieces and the portion sandwiched by the pair of facing notches is straddled across the abutment. Be provided The features.

Further, in the above, the pair of guide pieces are extended from both ends of the portion sandwiched by the pair of facing notches, but in addition to this, the guide piece extending from one end of the portion sandwiched by the pair of facing notches. May be provided, and the guide rod may be inserted between the guide piece and a portion sandwiched by a pair of notches facing each other.

Alternatively, one of the guide rod portions on both sides of the abutment may be fixed to the guide piece by caulking or the like, instead of being movable with respect to the guide piece.

[Action]

The guide rod is mounted in a state in which the guide rod is inserted between a guide piece provided on the spacer expander and a portion sandwiched by a pair of facing notches and straddles the abutment. Therefore, when assembling the spacer expander into the oil ring groove of the piston, if the gap of the spacer expander is expanded, the gap will be a guide piece provided on the spacer expander and a portion sandwiched by a pair of facing notches. It moves along the guide rod that passes through the gap, and the abutment is always guided and expanded by the guide rod. Then, after inserting into the oil ring groove of the piston, when the spacer expander's abutment is closed, the aforesaid part is sandwiched between the guide piece provided on the spacer expander and a pair of notches facing each other. The spacer expander returns to the original state in which the abutment is closed without overlapping the ends of the abutment by moving along the guide rod passing through between the abutment and the guide rod.

〔Example〕

1 to 3, in a spacer expander 1, a pair of circumferentially extending upper pieces 2 and lower pieces 3 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. And, from the both ends 10 and 11 to the first and second notches 8 and 9, respectively,
A pair of guide pieces 12 and 13 that are bent and folded inward from the upper and lower ends of the connecting piece 4 are provided, and the pair of guide pieces 12 and 13 and the connecting piece 4 form a guide rod 16 ( A guide portion having a guide hole 14 through which a (described later) is inserted is formed.

This spacer expander 1 is formed as follows.

As shown in FIG. 4, the material 15 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. However, the first and second notches 8 and 9 from both ends 10 and 11 respectively.
The guide pieces 12 and 13 extending in the width direction are provided on the. The contour of the hexagonal oil hole 7 is composed of a pair of straight line portions 7a and 7b parallel to the longitudinal edge of the material 15 and a pair of dogleg portions 7c and 7d symmetrically arranged in the longitudinal direction. Further, the contour of the cutout portion 8 is parallel to the longitudinal edge of the material 15 which connects the inner end portions of a pair of outwardly extending C-shaped linear portions 8a and 8b arranged facing each other in the longitudinal direction. It is composed of a straight line portion 8c and a pair of straight line portions 8d and 8e extending from the outer ends of the pair of V-shaped straight line portions 8a and 8b to the edge perpendicular to the longitudinal edge of the material 15. The pair of V-shaped linear portions 8a and 8b are provided in the oil hole 7
It is parallel to the adjacent sides of the dogleg shaped portions 7c and 7d. The contour of the notch 9 has the same shape and size as the notch 8, and a pair of C-shaped linear portions 9a and 9b, a linear portion 9c parallel to the longitudinal edge of the material 15, and the material 15 It is composed of a pair of straight line portions 9d, 9e extending to the edge perpendicular to the longitudinal edge. And
The guide piece 12 is a strip-shaped piece and extends from the straight line portion 8c of the cutout portion 8 parallel to the longitudinal edge of the material 15 to the edge perpendicular to the longitudinal edge of the material 15. Guide piece 13 is also a guide piece
It has the same shape and size as 12 and is provided in the notch 9 in the same manner as the guide piece 12.

The material 15 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. Then, the pair of guide pieces 12, 13 are bent and folded in the respective directions, and the guide pieces are joined together with the connecting piece 4.
A guide portion having a guide hole 14 through which 16 (described later) is smoothly inserted is formed.

The guide rod 16 has a circular cross section and is a curved round rod having substantially the same curvature as that of the spacer expander 1. However, the cross sectional shape thereof is not limited to a circular shape, and the guide rod 16 is curved with a curvature close to that of the spacer expander 1. The better The guide rod 16 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 rod 16 is inserted into the guide hole 14 of the guide portion formed by the pair of guide pieces 12 and 13 and the connecting portion piece 4 which are provided on both sides of the spacer expander 1 with the joint opening interposed therebetween. It is mounted on the spacer expander 1 in a state of straddling over. Bent portions 17 and 18 are provided at both ends of the guide rod 16, and these bent portions 17 and 18 are provided.
Is locked to the guide pieces 12 and 13 so as not to come off from the guide portion formed by the guide pieces 12 and 13 and the connecting piece 4.

Therefore, as shown in FIG. 3, when the spacer expander 1 is assembled in the oil ring groove 20 of the piston 19,
When the abutment of the spacer expander 1 is expanded, the guide portion formed by the guide pieces 12 and 13 and the connecting piece 4 provided in the spacer expander 1 moves along the guide rod 16, and the abutment is always guided. It is spread by being guided by a stick 16. Then, after the spacer expander 1 is fitted in the oil ring groove 20 and the joint opening of the spacer expander 1 is closed, the guide portion formed by the guide pieces 12 and 13 and the connecting piece 4 provided in the spacer expander 1 is similar to the above. The spacer expander 1 returns to the original state in which the abutment is closed without moving the abutment ends 10 and 11 so as to move along the guide rod 16 so that the abutment is always guided by the guide rod 16.

In FIG. 3, reference numerals 21 and 22 denote side rails disposed on the upper and lower surfaces of the spacer expander 1, and 23 denotes a cylinder, which are the side rail pressing pieces 5 and 6 of the spacer expander 1.
The side rails 21 and 22 are pressed by the cylinder 23
Is pressed against the inner wall surface of the.

Although the bent portions 17 and 18 are provided at both ends of the guide rod 16 in the above example, the present invention is not limited to this, and may be provided at other portions, for example, at the center of the guide rod 16. Further, in the above example, the bent portions 17 and 18 are provided on the guide rod 16 as the engaging portions with the guide pieces 12 and 13, but the engaging portions are not limited to this, and other such as flat 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.

In the above example, the guide rod 16 has a length that extends over the abutment and is arranged on a part of the entire circumference of the spacer expander 1. A guide bar 16 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 16 are arranged at positions opposite to the abutment by 180 degrees.

Further, the guide pieces 12 and 13 are preferably provided near both the abutment end portions 10 and 11 as described above, but may be provided at a position apart from the abutment end portions 10 and 11. However, in that case, the length of the guide rod 16 becomes long. Also, the guide pieces 12,1
At least one 3 may be provided on each side of the gap.

Further, in the above example, the guide pieces 12 and 13 on both sides sandwiching the abutment
The guide portion formed by the connecting piece 4 and the connecting piece 4 is configured to be movable along the guide rod 16, but by caulking one of the guide pieces 12 and 13 on both sides of the abutment, It may be fixed, and in this case, the guide rod 16 does not need a locking portion.

In the above example, the pair of guide pieces 12 and 13 extending from the upper end and the lower end of the connecting piece 4 are provided, but one pair of the upper end and the lower end of the connecting piece 4 is not provided. It is also possible to provide a guide piece extending from the inside to the connecting portion piece 4 and allow the guide rod 16 to be inserted between this guide piece and the connecting portion piece 4.

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. 5, for example, the side rail pressing piece 5, of the spacer expander 1 having a substantially U-shaped cross-section, The tip end of 6 is provided with inwardly bent portions 5a and 6a, and the oil ring groove 20 is provided at these tip ends 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 piece forms a part of the spacer expander, there is no risk of the guide piece falling off when it is attached to the piston, and it can be formed by punching from a thin steel strip and forming. Therefore, as compared with the case where the guide member is fixedly attached to the spacer expander by welding or the like, there is no fear of impairing the characteristics of the spacer expander. Further, by fixing one of the guide rods on both sides of the abutment to the guide piece by caulking or the like, it is not necessary to provide the guide rod with a locking portion. And, it is possible to reliably prevent the abutment ends of the spacer expanders from overlapping.

[Brief description of drawings]

FIG. 1 is a perspective view showing the vicinity of a gap of a spacer expander according to an embodiment of the present invention equipped with a guide rod, and FIG. 2 is an enlarged perspective view of a gap of a spacer expander near the gap.
Fig. 4 is a cross-sectional view of the oil ring groove part of the piston incorporating the side rail and the spacer expander of Fig. 1,
FIG. 5 is a plan view showing the material of the spacer expander, and FIG. 5 is a 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 is a notch, 10 and 11 are abutment ends, 12 and 13 are guide pieces, 14 is a guide hole, and 16 is a guide. Rods, 17, 18 are locking parts, 19
Is a piston, 20 is an oil ring groove, 21 and 22 are side rails, and 23 is a cylinder.

Claims (4)

[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. A pair of upright side rail pressing pieces, a plurality of oil holes in the circumferential direction, and a pair of opposed notches extending radially from the tips of the pair of side rail pressing pieces between the oil holes. In a substantially U-shaped spacer expander in cross section of a combined oil ring provided with a large number of in the circumferential direction, on both sides sandwiching the abutment of the spacer expander,
Providing a pair of guide pieces that extend inward from both ends of the portion sandwiched by the pair of opposing cutout portions and are bent in the respective directions, and sandwiched by these guide pieces and the pair of opposing cutout portions. A structure for preventing overlap of a spacer expander of a combined oil ring, characterized in that a guide rod that penetrates the portion is provided so as to straddle the abutment. 2. 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. A pair of upright side rail pressing pieces, a plurality of oil holes in the circumferential direction, and a pair of opposed notches extending radially from the tips of the pair of side rail pressing pieces between the oil holes. In a substantially U-shaped spacer expander in cross section of a combined oil ring provided with a large number of in the circumferential direction, on both sides sandwiching the abutment of the spacer expander,
A guide piece extending from one end of a portion sandwiched by the pair of opposed cutout portions is provided, and a guide rod inserted between the guide piece and the portion sandwiched by the paired opposed cutout portion straddles the abutment. A structure for preventing the overlapping of the spacer expander of the combined oil ring, which is characterized in that it is provided so as to overlap. 3. A pair of circumferentially extending upper and lower pieces are axially spaced 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. A pair of upright side rail pressing pieces, a plurality of oil holes in the circumferential direction, and a pair of opposed notches extending radially from the tips of the pair of side rail pressing pieces between the oil holes. In a spacer expander having a substantially U-shaped cross section of a combined oil ring provided with a large number of circumferentially-oriented oil rings, on one of both sides sandwiching the abutment of the spacer expander, from both ends of the portion sandwiched by the pair of facing notches. A pair of guide pieces extending inward and bent in the respective directions are provided, and a guide rod that penetrates between the guide pieces and the portion sandwiched by the pair of facing notches is straddled over the abutment. Provided as above A pair of guide pieces that extend inward from both ends of the portion sandwiched by the pair of notches facing each other with the guide rod portion on the opposite side of the side where the id piece is provided and the abutment, and are bent in the respective directions. A structure that prevents the abutment of the spacer expander of the combined oil ring that is fixed to the. 4. 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. A pair of upright side rail pressing pieces, a plurality of oil holes in the circumferential direction, and a pair of opposed notches extending radially from the tips of the pair of side rail pressing pieces between the oil holes. In a spacer expander having a substantially U-shaped cross section of a combined oil ring provided with a large number of circumferentially-directions, one of both sides sandwiching the abutment of the spacer expander, from one end of the portion sandwiched by the pair of facing notches. An extending guide piece is provided, and a guide rod that penetrates between the guide piece and the portion sandwiched by the pair of opposed notches is provided across the abutment, and the side on which the guide piece is provided sandwiches the abutment. On the other side Abutment overlap prevention structure of the spacer expander of the combination oil ring, characterized in that fixed to the guide piece extending from one end of the guide rod portions sandwiched between the pair of cutout portions for the opposing portion.