JP2000018386A - Spacer expander of oil ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide spacer expanders of an oil ring capable of smoothing and ensuring cutting made with an assembly machine. SOLUTION: A plurality of spacer expanders 11 for an annular oil ring open at each end are stacked and mounted in a cylindrical assembly machine magazine 32 while increased in diameter. Each spacer expander 11 is displaced upward by its width by a pushing member 43 or the like that abuts against the lower end of the lowermost spacer expander 11, so that the uppermost spacer expander 11 is removed from the upper end of the assembly machine magazine 32. Therefore, the spacer expanders 11 are assembled in the oil ring grooves 2 of a piston 1. Each spacer expander 11 is corrugated such that its inner and outer peripheral surfaces are both displaced in the direction of the axis of the annular shape, with the corrugations on the inner periphery having a higher corrugation height value than the corrugations on the outer periphery. When the plurality of spacer expanders 11 are stacked, the corrugations on their inner peripheries are made to abut against one another.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer expander used for an oil ring combined with a piston for an internal combustion engine.

[0002]

2. Description of the Related Art A piston ring mounted on a piston ring groove formed in a piston of an internal combustion engine adjusts an amount of lubricating oil on a cylinder inner wall surface of the engine.
There is an oil ring that scrapes off excess oil. Conventionally,
Such an oil ring is disclosed in, for example,
The one described in JP-A-220263 is known. That is, as shown in FIG. 6, the oil ring described in the publication is constituted by a side rail 60 formed in a substantially donut shape and a spacer expander 61 formed in a radially displaced waveform. ing. The side rail 60 is mounted in the piston ring groove so as to contact the inner wall surface of the cylinder to scrape off oil. The spacer expander 61 attaches the side rail 60 to the inner wall surface of the cylinder. It is for the momentum.

Incidentally, the spacer expander 61 formed in a waveform displaced in the radial direction described in the above-mentioned publication.
In the case of, due to its structure, to reduce the tension by reducing the width,
Since it is difficult to reduce the fuel consumption rate, in recent years, as shown in FIG. 7, a spacer expander formed in a waveform displaced in the axial direction (width direction) and having a small width is used. There is a tendency.

The detailed shape of such a spacer expander will be described with reference to FIG. In FIG. 8, FIG. 8A shows the spacer expander 5 shown in FIG.
8 is a partial side view of the spacer expander 51 viewed from the outer peripheral side, and FIG. 8B is a partial side view of the spacer expander 51 viewed from the outer peripheral side.

As shown in FIGS. 8 (a) and 8 (b),
The height (width) W11 of the waveform 52 on the inner peripheral side is the waveform 5 on the outer peripheral side.
3 is formed higher than the height (width) W12. The side rails have different heights (widths).
It is accommodated in a space formed by the outer wall of the spacer expander 51 having the waveforms 52 and 53 of W11 and W12 and the inner wall of the piston ring groove.

Next, an operation mode for assembling the spacer expander 51 into the oil ring groove will be described with reference to FIG. FIG. 9 is a partial sectional view showing an assembling machine 40 for performing the above assembling work.

As shown in FIG. 9, the spacer expander 51 is elastically deformed so as to be spread slightly outward around a cylindrical assembling machine magazine 32 fixed on a work table 31. Fitted and stacked in multiple layers. The piston 1 is inserted upside down into the assembling machine magazine 32 such that the height of the upper end (the lower end in FIG. 9) of the oil ring groove 2 of the piston 1 matches the height of the upper surface of the assembling machine magazine 32. , Are supported by a support device (not shown).

On the other hand, the support 41 of the assembling machine 40 is provided with a support rod 42 which can move in the vertical direction of the support 41. Each time the piston 1 is disposed in the assembling machine magazine 32 as described above by a pressure (pneumatic) circuit (not shown), the support rod 42 is provided with the width of the spacer expander 51 (the height of the waveform 52 on the inner peripheral side). ) It is moved upward by W11. A substantially donut plate-shaped extruding member 43 having a hole 44 through which the assembling machine magazine 32 penetrates is provided at the tip end side of the support rod 42.

Here, the support rod 42 is connected to the pushing member 4.
The spacer expander 5 whose upper surface is stacked as described above.
1 is arranged so as to contact the lower end of the spacer expander located at the lowest stage. As described above, the support bar 42 is moved upward by the width W11 of the spacer expander 51 each time the piston 1 is disposed. As a result, each spacer expander 51 is sequentially pushed up, and the spacer expander 5 located at the uppermost stage is raised.
1 is pushed out of the assembly machine magazine 32. When the extruded spacer expander 51 returns to its original shape due to its elastic force, the extruded spacer expander 51 is separated from the lower spacer expander 51 (hereinafter, such separation is referred to as “cut out”), and the oil ring groove 2 is formed. It is fitted to.

[0010]

As shown in FIGS. 8 (a) and 8 (b), the spacer expander 51 normally has both end portions 53a of the waveform 53 on the outer circumference side. The waveform 52 has a shape protruding outward as compared with both side end portions 52a, so that the following inconvenience at the time of cutting out cannot be ignored.

That is, in a state where the spacer expanders 51 are stacked for the assembling work, as shown in FIG. 10A when viewed from the inner peripheral side, and FIG. As shown in b).
As shown in FIGS. 10A and 10B, both end portions 53 a of the outer peripheral waveform 53 have a shape protruding outward from both end portions 52 a of the inner peripheral waveform 52, and are stacked. The spacer expander 51 provided has an inner peripheral side waveform 52.
Are not contacted at both end portions 52a, but come into contact at both end portions 53a of the outer peripheral waveform 53. For this reason, when the uppermost spacer expander 51 is cut out as described above, the spacer expanders 51 interfere with each other until they are completely separated from the lower spacer expander 51. In addition, since the period of interfering with each other becomes long, the fitting of the pushed spacer expander 51 to the oil ring groove 2 may be hindered.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a spacer expander for an oil ring that can smoothly and reliably cut out by such an assembling machine. It is in.

[0013]

In order to achieve the above object, the invention according to claim 1 has an annular shape having both ends opened, and a plurality of cylindrical magazines having an expanded diameter are provided. Stacked and mounted items are shifted in one direction by the width of the magazine and removed from one end of the magazine, receiving their inward bias by their own elastic force, and assembling them in the oil ring groove of the piston Oil ring spacer expander, the inner peripheral surface and the outer peripheral surface of which are both formed in a waveform displaced in the axial direction of the ring, and the waveform on the inner peripheral side is larger than the waveform on the outer peripheral side. The gist of the invention is that the waveforms on the inner peripheral side are brought into contact with each other when the plurality of layers are stacked.

According to a second aspect of the present invention, in the oil ring spacer expander according to the first aspect, both end portions of the inner peripheral side waveform project outward from both side end portions of the outer peripheral side waveform. The main point is to become.

According to a third aspect of the present invention, in the oil ring spacer expander according to the second aspect, a tangent line of the inner peripheral waveform at a reference position of the displacement of the inner peripheral waveform is the axis of the ring. The angle formed with respect to the line of direction is
The gist is that the tangent of the outer peripheral waveform at the reference position of the same displacement of the outer peripheral waveform is smaller than the angle formed with respect to the axial straight line of the same ring.

According to the first to third aspects of the present invention, the inner peripheral surface and the outer peripheral surface of the spacer expander of the oil ring are both formed in a waveform displaced in the axial direction of the ring. The waveform on the side has a larger peak value than the waveform on the outer side, and the waveforms on the inner side are in contact with each other when a plurality of layers are stacked. Therefore, the spacer expanders stacked and mounted on the cylindrical magazine in an expanded state are shifted in one direction by the width thereof and removed from one end of the magazine, whereby the spacer expander is moved to the piston. Is substantially completed with an extremely short interference period in which the waveforms on the inner peripheral side of the adjacent spacer expanders are separated from each other. For this reason, the cutting of the spacer expander to be assembled into the oil ring groove can be performed more smoothly and reliably.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an oil ring spacer expander according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing an outline of a piston to which the spacer expander of the present embodiment is assembled. As shown in FIG. 1, a piston 1 formed in a substantially closed cylindrical shape has three piston ring grooves 2, 3, and 4 formed along its circumferential direction. Compression rings 6 and 7 each having a substantially donut shape are assembled to the piston ring grooves 3 and 4, respectively. These compression rings 6 and 7 seal the space between the piston 1 and the cylinder accommodating the piston 1 to prevent air-fuel mixture or combustion gas leakage. An oil ring 5 including two side rails 9 and a spacer expander 11 is attached to the piston ring groove 2. The oil ring 5 adjusts the amount of lubricating oil on the inner wall surface of the cylinder and scrapes off excess oil. The side rail 9 is formed in a substantially donut plate shape, and is mounted in the piston ring groove 2 so as to contact the inner wall surface of the cylinder to scrape off oil. The spacer expander 11 urges the side rail 9 toward the inner wall surface of the cylinder.

Next, the structure of the spacer expander 11 in the present embodiment will be further described with reference to FIGS. As shown in the plan view of FIG. 2, the spacer expander 11 has an inner peripheral surface 11a and an outer peripheral surface 11b, and is open at an opening 11c.

The shapes of the inner peripheral surface 11a and the outer peripheral surface 11b will be described in more detail with reference to FIGS. FIG. 3A is a partial side view of the spacer expander 11 viewed from the inner peripheral side, and FIG. 3B is a partial side view of the spacer expander 11 viewed from the outer peripheral side. FIG.
FIG. 4 is a sectional view taken along line 4-4 in FIG.

As shown in FIGS. 3A, 3B and 4, the inner peripheral surface 11 a is formed by repetition of an inner peripheral waveform 12 displaced in the width direction of the spacer expander 11. The outer peripheral surface 11b is formed by repeating a waveform 13 on the outer peripheral side which is also displaced in the width direction corresponding to the waveform 12 on the inner peripheral side. The height (width) W1 of the inner peripheral waveform 12 is formed higher than the height (width) W2 of the outer peripheral waveform 13.
The side rail 9 (FIG. 1) is formed by the outer wall of the spacer expander 11 having the waveforms 12 and 13 having the different heights (widths) W1 and W2 and the inner wall of the piston ring groove 2. Housed in space. The middle of the inner and outer waveforms 12 and 13 is formed by repeating a waveform having a height (width) W3 lower than the heights (widths) W1 and W2.

Here, the widths W1 and W2 of the waveform 12 on the inner peripheral side and the waveform 13 on the outer peripheral side of the spacer expander 11
The equidistant line H is the inner peripheral waveform 12 and the outer peripheral waveform 13
Is a reference position of the displacement. Then, the inner peripheral side waveform 12 and the outer peripheral side waveform 13 at this reference position
Width direction (axial direction of the ring of the spacer expander 11)
Is a straight line V, and tangent lines of the inner peripheral side waveform 12 and the outer peripheral side waveform 13 at the same reference position are a straight line L1 and a straight line L2, respectively. In the spacer expander 11 according to the present embodiment, FIG. (A) and (b), the angle θ formed by the straight line V and the straight line L1
1 is smaller than the angle θ2 formed by the straight line V and the straight line L2,
2a is shaped to protrude outward from both end portions 13a of the waveform 13 on the outer peripheral side.

The state in which the spacer expanders 11 thus formed are stacked will be described with reference to FIG. Here, FIG. 5 is a partial side view showing a state where two spacer expanders 11 are stacked, and FIG.
FIG. 5A is a view from the inner side of the expander 11 shown in FIG.
Are each viewed from the outer peripheral side. Inner circumference waveform 1
2 are both end portions 13a of the outer peripheral waveform 13.
5A, since the shape protrudes outward from FIG.
As shown in (a) and (b), the stacked spacer expanders 11 are provided at both end portions 1 of the waveform 12 on the inner peripheral side.
2a, both end portions 13 of the outer peripheral waveform 13
a is separated.

Therefore, when such a spacer expander 11 is assembled into the oil ring groove 2 of the piston 1 through the assembling machine 40 illustrated in FIG. 9, the width of the spacer expander 11 of the support rod 42 ( Each time the spacer expander 11 located at the uppermost position is urged inward by its own elastic force with the upward movement by W1 (height of the inner peripheral side waveform 12), it is sequentially cut out. However, here, as described above, each adjacent spacer expander 11 is connected to both end portions 1 of the inner peripheral waveform 12.
Since the contact is made only by 2a, the cut-out is substantially completed with a very short interference period in which both end portions 12a of the inner peripheral waveform 12 are separated from each other. For this reason, the cut-out of the spacer expander 11 assembled to the oil ring groove 2 is performed more smoothly and reliably.

By the way, in such assembling work,
In the conventional spacer expander 52, there is a possibility that an assembling defect such as an incorrect fitting in the oil ring groove 2 occurs about twice an hour. In addition, due to the improper assembling per one time, the assembling machine 40 also takes about 2 minutes,
You need to pause. That is, a time loss of about 4 minutes per hour was caused. For example, assuming that one assembling operation is completed per minute, in the case of the spacer expander 11 according to the present embodiment, by eliminating such a lost time (4 minutes), it is possible to reduce the number of operations per hour to four.
It will also be possible to perform two additional assembly operations.

As described in detail above, according to the present embodiment, the following effects can be obtained. (1) The spacer expander 11 that is assembled to the oil ring groove 2 of the piston 1 can be cut out smoothly and reliably, and the occurrence of defects or the like can be suitably prevented. And the assembling machine 40 associated with such a cutting defect
Can be eliminated, and the workability of the assembling can be greatly improved.

In the present embodiment, the angle θ
By setting 1, θ2, both end portions 1 of the inner peripheral side waveform 12 are set.
Although the shape of 2a is made to protrude outside both end portions 13a of the waveform 13 on the outer peripheral side, a method for obtaining such a shape is arbitrary. In short, any shape may be used as long as both end portions 12a of the inner peripheral waveform 12 protrude outward from both end portions 13a of the outer peripheral waveform 13. Further, when a plurality of spacer expanders 11 are stacked, it is only necessary that the shape be such that the waveforms on the inner peripheral side are in contact with each other.

Next, technical ideas other than the claims that can be grasped from the above embodiment will be described below together with their effects. (1) A plurality of oil-ring spacer expanders having an annular shape with both ends opened are stacked and mounted on a cylindrical magazine in a state where the diameter is expanded, and these are mounted in one direction by the width of the spacer expander. By shifting and removing from one end of the magazine, an oil ring spacer expander for assembling the spacer expander into an oil ring groove of a piston arranged corresponding to one end of the magazine based on its own elastic force. In the assembling method, as the spacer expander, the inner peripheral surface and the outer peripheral surface are both formed into waveforms displaced in the axial direction of the ring, and the waveform on the inner peripheral side has a larger peak value than the waveform on the outer peripheral side. When stacking the plurality, a spacer expander is used in which the waveforms on the inner peripheral side are in contact with each other. Method of assembling the oil ring spacer expander that.

According to the assembling method, as the spacer expander, the inner peripheral surface and the outer peripheral surface are both formed into waveforms displaced in the axial direction of the ring, and the waveform on the inner peripheral side is smaller than the waveform on the outer peripheral side. Also, by using a spacer expander in which the waveforms on the inner peripheral side are brought into contact with each other when stacking the plurality of pieces, the assembling work is performed by using the waveform on the inner peripheral side of the adjacent spacer expander. It is substantially completed with a very short interference period that only separates each other. For this reason, it is possible to smoothly and reliably cut out the spacer expander, and it is possible to suitably prevent the occurrence of a defect or the like. In addition, the temporary stop of the assembling machine due to such poor cutting can be resolved, and the workability of the assembling can be greatly improved.

(2) A plurality of oil ring spacer expanders having an annular shape whose both ends are opened are stacked and mounted on a cylindrical magazine in a state where the diameter is expanded, and are mounted by the width of the spacer expander. An oil ring spacer that shifts in one direction and is detached from one end of the magazine to assemble the spacer expander based on its own elastic force into an oil ring groove of a piston disposed corresponding to one end of the magazine. In the expander assembling device, as the spacer expander, the inner peripheral surface and the outer peripheral surface are both formed into waveforms displaced in the axial direction of the ring, and the waveform on the inner peripheral side is larger than the waveform on the outer peripheral side. A spacer expander which has a peak value and in which the waveforms on the inner peripheral side are brought into contact with each other when the plurality of layers are stacked is used. Preparative oil ring spacer expander assembly apparatus according to claim.

According to the assembling apparatus, as the spacer expander, the inner peripheral surface and the outer peripheral surface are both formed into a waveform that is displaced in the axial direction of the ring, and the waveform on the inner periphery is smaller than the waveform on the outer periphery. Also, by using a spacer expander in which the waveforms on the inner peripheral side are brought into contact with each other when stacking the plurality of pieces, the assembling work is performed by using the waveform on the inner peripheral side of the adjacent spacer expander. It is substantially completed with a very short interference period that only separates each other. For this reason, it is possible to smoothly and reliably cut out the spacer expander, and it is possible to suitably prevent the occurrence of a defect or the like. In addition, the temporary stop of the assembling machine due to such poor cutting can be resolved, and the workability of the assembling can be greatly improved.

[0032]

As described above in detail, according to the first to third aspects of the present invention, the spacer expander to be assembled into the oil ring groove of the piston is smoothly and reliably cut out, and the occurrence of a defect or the like occurs. Can be suitably prevented. In addition, the temporary stop of the assembling machine due to such poor cutting can be resolved, and the workability of the assembling can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a piston to which an embodiment of a spacer expander according to the present invention is applied.

FIG. 2 is a plan view showing a spacer expander of the embodiment.

FIG. 3 is a partial side view showing the spacer expander of the embodiment.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a partial side view showing a state where the spacer expanders of the embodiment are stacked.

FIG. 6 is a plan view showing an example of a conventional spacer expander.

FIG. 7 is a plan view showing another example of a conventional spacer expander.

FIG. 8 is a partial side view showing a side shape of the conventional spacer expander shown in FIG.

FIG. 9 is a partial cross-sectional view showing an assembling mode of the spacer expander.

FIG. 10 is a partial side view showing a state where the spacer expanders are stacked.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Piston, 2 ... Oil ring groove, 5 ... Oil ring, 11 ... Spacer expander, 11a ... Inner peripheral surface, 1
1b: outer peripheral surface, 11c: opening, 12: outer peripheral side waveform,
12a, 13a: end portion, 13: inner peripheral side waveform, 32: assembly machine magazine.

Continuation of the front page (72) Inventor Yoshihiko Masuda 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tomoji Kondo 5-2-6 Honmachi Nishi, Yono City, Saitama Japan Piston Ring Co., Ltd. Inside the Yono Plant (72) Inventor Akira Takahashi 5-2-6 Honcho Nishi, Yono-shi, Saitama Japan Piston Ring Inside the Yono Plant F-term (reference) 3J044 AA18 CB31 DA17 EA05

Claims (3)

[Claims] 1. An annular shape having both ends opened,
Those that are stacked and mounted on a cylindrical magazine in an expanded state are shifted in one direction by the width of the magazine and removed from one end of the magazine, so that they can be moved inward by their own elastic force. An oil ring spacer expander that is urged and assembled into an oil ring groove of a piston, wherein an inner peripheral surface and an outer peripheral surface are both formed into a waveform that is displaced in an axial direction of a ring, and an inner peripheral side is formed. Has a larger peak value than the waveform on the outer peripheral side, and the waveforms on the inner peripheral side are brought into contact with each other when the plurality of layers are stacked, the spacer expander for an oil ring. 2. The both end portions of the inner peripheral waveform project outward from both end portions of the outer peripheral waveform.
The spacer expander of the described oil ring. 3. An angle formed by a tangent of the inner peripheral waveform at a reference position of the displacement of the inner peripheral waveform with respect to a straight line in the axial direction of the ring is the same displacement of the outer peripheral waveform. 3. The spacer expander for an oil ring according to claim 2, wherein a tangent of the waveform on the outer peripheral side at the reference position is smaller than an angle formed with respect to an axial straight line of the same ring.