JP2876361B2 - Piston for slant engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston provided in a cylinder of a slant engine.

[0002]

2. Description of the Related Art Conventionally, for example, a typical in-line engine for an automobile has a cylinder extending in a vertical direction, in which a piston having a compression ring and an oil ring mounted on an outer periphery of a piston body is disposed. ing. In this type of engine, when the pressure in the combustion chamber becomes negative, the air on the crankcase side is sucked into the combustion chamber through the space between the inner circumference of the cylinder and the outer circumference of the piston. There is a problem that it is carried into the combustion chamber together with the air, burned and consumed.

In order to solve such a problem, Japanese Patent Laid-Open Publication No. Sho 56-122748 discloses a "piston" in which the inner and outer peripheries of a piston body immediately above an oil ring are communicated with a vent hole. According to this piston, even if the pressure in the combustion chamber becomes negative, the air on the crankcase side passes through the vent hole, passes between the inner circumference of the cylinder and the outer circumference of the piston, and reaches the combustion chamber. Oil is not carried into the combustion chamber with the air. In this way, it is possible to reduce oil consumption.

[0004] In contrast to the aforementioned general vehicle engine,
In recent years, a so-called slant engine in which a cylinder is provided at a predetermined angle with respect to a vertical line has come to be mounted on an automobile, and it is conceivable to apply the technology of the above-mentioned publication to this slant engine.

[0005]

However, when the technique disclosed in the above publication is applied to a piston for a slanted engine as it is, as shown in FIGS. 32 and 33, a lower portion between the outer periphery of the piston and the inner periphery of the cylinder is provided. Oil F towards
The following problems newly arise from the flow-down and storage.

That is, when a load is applied to the slant engine and the pressure P1 on the combustion chamber 52 side becomes higher than the pressure P2 on the crankcase 53 side (P1> P2), the annular ring surrounded by the compression ring 55 and the oil ring 56 The combustion gas on the combustion chamber 52 side enters the space 57, and the pressure in the annular space 57 increases. At this time, if the ventilation hole 54 is located below the piston body 51 and is immersed in the oil F, the combustion gas does not escape from the ventilation hole 54. Therefore, the pressure in the annular space 57 increases, and this pressure pushes the oil F toward the combustion chamber 52 as shown by the arrow in FIG. Then, the oil F is burned in the combustion chamber 52, and the oil consumption increases.

For example, when the engine brake is applied and the pressure P1 on the combustion chamber 52 side becomes lower than the pressure P2 on the crankcase 53 side (P1 <P2), the vent 5
When the piston 4 is located below the piston body 51, the oil F in the annular space 57 is sucked toward the combustion chamber 52.
Therefore, also in this case, the oil F is burned in the combustion chamber 52, and the oil consumption increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent oil that has entered an annular space from moving toward a combustion chamber, thereby preventing an increase in oil consumption. It is an object of the present invention to provide a slant engine piston.

[0009]

According to the present invention , in order to achieve the above-mentioned object , the apparatus is installed in a state of being inclined with respect to a vertical line, and
Multiple piston rings are separated from each other around the
Each piston on the outer peripheral side of the piston body
Oil stays below the annular space defined by the ring.
The slanted engine piston
One end of the body is from the part where the oil in the annular space stays
Also open to the upper part, the other end is
Also open in a space different from the annular space in the upper part
Communication passage for gas distribution.

[0010]

[Function] Since the cylinder of the slant engine is inclined with respect to the vertical line, during operation of the slant engine,
Oil for lubrication is stored in the lower part of the cylinder and piston by gravity. Then, a part of the oil enters the annular space between the adjacent piston rings.

Here, for example, when a load is applied to the slant engine and the pressure of the combustion gas in the combustion chamber becomes higher than the pressure of the air in the crankcase, the combustion gas enters the annular space, thereby causing Pressure rises. However, the combustion gas in this annular space is
The inner space of the piston body at a portion above the oil storage portion, the annular space at a portion above the oil storage portion, through a communication passage provided at a portion above the oil storage portion in the piston body. To a different annular space or combustion chamber. By deriving this combustion gas,
The pressure rise in the annular space is suppressed. As a result, the oil that has entered the annular space is prevented from being pushed out toward the combustion chamber.

When the present invention is applied to a slant engine mounted on a vehicle, if the pressure of the combustion gas on the combustion chamber side becomes lower than the pressure of the air on the crankcase side when the engine brake is applied, an annular space is formed. The oil inside is about to be sucked into the combustion chamber. However, only the air in the crankcase passes through the annular space through the communication passage and is sucked into the combustion chamber. This prevents the oil that has entered the annular space from being carried into the combustion chamber.

[0013]

【Example】

(First Embodiment) A first embodiment in which the present invention is embodied in a piston for a slant engine mounted on a vehicle is shown in FIGS.
This will be described with reference to FIG.

FIG. 2 shows a slant engine 1 according to this embodiment.
It is sectional drawing which shows a part of. In the slant engine 1, the cylinder 2 is inclined at an inclination angle θa of 45 degrees or more and 90 degrees or less with respect to the vertical line L (θa = 75 degrees in the present embodiment). Further, in the slant engine 1, a combustion chamber 3 is disposed on an upper open end side of the cylinder 2, and a crankcase 4 in which oil is stored is disposed on a lower open end side.

A piston 7 connected to a crankshaft 6 by a connecting rod 5 is provided in the cylinder 2. The piston 7 has a closed-cylindrical shape, and is inserted into the cylinder 2 so as to be reciprocally movable, and a plurality (three in this embodiment) of pistons mounted on the outer periphery of the piston body 8. With a ring.

That is, as shown in FIG. 1, the top ring groove 9, the second ring groove 10 and the oil ring groove 11 are arranged in parallel on the outer periphery of the piston body 8 in order from the combustion chamber 3 side to the crankcase 4 side. It is formed in a state. Then, the top ring 12 is mounted on the top ring groove 9, and the second ring 13 is inserted into the second ring groove 10.
Are mounted, and an oil ring 14 is mounted in the oil ring groove 11. The top ring 12, the second ring 13, and the oil ring 14 constitute the plurality of piston rings. The top ring 1
The second ring 2 and the second ring 13 are for preventing gas leakage during the compression stroke and the explosion stroke.
Is for scraping off excess oil adhering to the inner peripheral surface of the cylinder 2 to prevent the oil from entering the combustion chamber 3. A slit 15 extending in the circumferential direction is formed on the inner wall of the oil ring groove 11 to absorb the thermal expansion of the piston body 8.

The aforementioned three piston rings 12 to 14
Are attached, three lands are formed on the outer peripheral surface of the piston main body 8. That is, the outer peripheral surface of the piston body 8 closer to the combustion chamber 3 than the top ring 12 is a top land 16. The outer peripheral surface of the piston body 8 sandwiched between the top ring 12 and the second ring 13 is a second land 17. An outer peripheral surface of the piston body 8 sandwiched between the second ring 13 and the oil ring 14 is a third land 18.

A first annular space 19 is formed by the top ring 12, the second ring 13, the second land 17, a part of the top ring groove 9, a part of the second ring groove 10, and the inner peripheral surface of the cylinder 2. ing. The second ring 13, the oil ring 14, the third land 18, a part of the second ring groove 10, a part of the oil ring groove 11, and the inner peripheral surface of the cylinder 2 make the second ring.
Annular space 20 is formed.

In the slant engine 1, since the cylinder 2 is inclined at an inclination angle θa (= 75 degrees) with respect to the vertical line L, as shown in FIG.
Is stored in the lower part of the cylinder 2 and the piston 7 by gravity. For this reason, the oil pressure in this portion becomes excessive, and a part of the oil F rises to the third land 18 without being completely scraped off by the oil ring 14. As a result, the oil F is stored in the lower portion of the third land 18. Assuming that the oil storage portion B of the piston body 8 at this time is B, the oil storage portion B has a predetermined angle on both sides in the circumferential direction with respect to a vertical line L passing through the axis A of the piston body 8 as shown in FIG. θb (15 degrees in this embodiment).
The predetermined angle θb has a different value depending on the inclination angle θa of the cylinder 2 and the tension of each piston ring.

In addition, the communication passage 2 is provided in the piston body 8.
1 is provided. One end of the communication passage 21 is open to the third land 18, that is, the second annular space 20 above the oil storage portion B (see FIG. 1). The communication passage 21 extends straight toward the axis A of the piston body 8, and the other end of the communication passage 21 is open to the inner surface of the piston body 8 at a position above the oil storage portion B.

Next, the operation and effect of the embodiment constructed as described above will be described. 1 and 3, when a load is applied to the slant engine 1 and the pressure P1 of the combustion gas on the combustion chamber 3 side becomes higher than the pressure P2 on the air on the crankcase 4 side (P1> P2), the combustion chamber 3 side The combustion gas of the second annular space 20 passes through the first annular space 19.
Get inside. As a result, the pressure in the second annular space 20 tends to increase.

However, in this embodiment, one end of the communication passage 21 is opened in the third land 18 above the oil storage portion B, and the other end of the communication passage 21 is connected to the third land 18 above the oil storage portion B. The piston body 8 has an opening on the inner surface. For this reason, the combustion gas in the second annular space 20 passes through the piston body 8 through the communication passage 21 and is guided to the crankcase 4 side. Due to the derivation of the combustion gas, the pressure rise of the combustion gas in the second annular space 20 is suppressed. Therefore, unlike the related art in which the ventilation hole 54 may be located below the slope, in the present embodiment, the oil F rising to the second annular space 20 is prevented from being pushed out to the combustion chamber 3 side, Unnecessary consumption of oil F due to combustion can be prevented.

Further, for example, when the engine brake is applied, the pressure P1 of the combustion gas in the combustion chamber 3 is reduced to the crankcase 4
When the pressure becomes lower than the pressure P2 of the air on the side (P1 <P2),
The oil F in the second annular space 20 tends to be sucked into the combustion chamber 3 side. However, in the present embodiment, the air in the crankcase 4 flows through the communication passage 21 to the second annular space 2.
The air is sucked into the combustion chamber 3 through the 0 and the first annular space 19. Therefore, unlike the prior art, in the present embodiment, the oil F rising to the second annular space 20 is prevented from being carried into the combustion chamber 3, and unnecessary consumption of the oil F due to combustion is prevented. it can.

FIG. 5 is a graph showing the relationship between the engine speed and the oil consumption when a load is applied to the slant engine 1. In the drawing, the solid line indicates the case where the communication path 21 is provided as described above (this embodiment), and the broken line indicates the communication path 2.
The case where 1 is not provided (Comparative Example) is shown. From this figure, it can be seen that the effect of reducing the oil consumption by the communication passage 21 can be seen in almost all the rotation speed regions except the low rotation speed region.

As described above, in this embodiment, the piston body 8
A communication path 21 is provided, one end of which is opened to the second annular space 20 above the oil storage portion B, and the other end is opened to the inner surface of the piston body 8 above the oil storage portion B. I let it. For this reason, while the slant engine 1 is operating, the oil F enters the lower portion of the second annular space 20, but prevents the oil F from moving to the combustion chamber 3 and being burned, thereby increasing oil consumption. Can be prevented. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The first embodiment is characterized in that the communication passage 21 is bent in the piston body 8 and the other end of the communication passage 21 is opened to the inner wall of the slit 15 above the oil storage portion B in this embodiment. It is different from the example.

Therefore, according to this embodiment, the second annular space 20 and the inside of the piston body 8 are communicated by the communication passage 21. Therefore, similarly to the first embodiment, it is possible to prevent the oil F that has entered the second annular space 20 from moving to the combustion chamber 3 side, thereby preventing an increase in oil consumption. Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.
It will be described based on.

In this embodiment, a notch 22 is formed in a part of the inner wall 10a on the crankcase 4 side in the second ring groove 10 above the oil storage portion B. The surface 22 a of the notch 22 on the side of the crankcase 4 is an inclined surface that is separated from the second ring 13 as it approaches the third land 18. Then, as shown in FIG. 8, in a state where the second ring 13 is in contact with the inner wall 10a, the notch 22 and the second ring groove 1 are formed.
A communication path 21 is constituted by a part of the zero.

Therefore, one end of the communication passage 21 opens into the second annular space 20 at a portion above the oil storage portion B, and the other end has a first position at the portion above the oil storage portion B. That is, it opens to the annular space 19. The configuration other than the above is the same as that of the first embodiment.

According to this embodiment, the following actions and effects are obtained only when the pressure P1 of the combustion gas in the combustion chamber 3 becomes lower than the pressure P2 of the air in the crankcase 4 (P1 <P2). Play. That is, under this condition, the oil F in the second annular space 20 tends to be sucked into the combustion chamber 3 side, but the combustion gas in the second annular space 20 is
As shown by an arrow in FIG. 8, the air is sucked into the first annular space 19 through the communication passage 21. Therefore, according to the present embodiment, the oil F rising to the second annular space 20 is prevented from being carried into the combustion chamber 3 under the above-mentioned condition (P1 <P2), and the oil F generated by the combustion is prevented. Unnecessary consumption can be prevented. (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS.

The present embodiment differs from the third embodiment in that a groove 23 is formed in the second ring groove 10 on the inner wall 10a on the crankcase 4 side instead of the notch 22. The groove 23 extends straight from the third land 18 toward the axis A of the piston body 8 and reaches a position deeper than the second ring groove 10. The surface 23 a of the groove 23 on the side of the crankcase 4 is substantially parallel to the second ring 13. Then, as shown in FIG. 11, in a state where the second ring 13 is in contact with the inner wall 10a,
The communication path 21 is formed by the groove 23 and a part of the second ring groove 10.

Therefore, according to the present embodiment, the same operation and effect as those of the third embodiment can be obtained. In addition, since the groove 23 extends to a position deeper than the second ring groove 10, the first annular shape of the combustion gas can be obtained. The suction into the space 19 is the second ring 1
3 without any interruption. (Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIGS.

This embodiment differs from the third embodiment in that a cutout 22 is formed in a part of the inner wall 11b on the combustion chamber 3 side in the oil ring groove 11 above the oil storage portion B. ing. The surface 22 b of the notch 22 on the combustion chamber 3 side is closer to the third land 18 so that the oil ring 1
4 is inclined. Then, as shown in FIG. 14, the notch 22 and the oil ring groove 11 are formed.
And the slit 15 form a communication path 21. Accordingly, one end of the communication passage 21 opens to the second annular space 20 at a portion above the oil storage portion B, and the other end opens to the inner surface of the piston body 8 at a portion above the oil storage portion B. Will be.

According to this embodiment, the same operations and effects as those of the second embodiment can be obtained. That is, when the pressure P1 of the combustion gas on the combustion chamber 3 side is higher than the pressure P2 of the air on the crankcase 4 side (P1> P2), the combustion gas on the combustion chamber 3 side enters the second annular space 20. Although entering, the combustion gas exits through the communication passage 21 into the piston body 8. When the pressure P1 of the combustion gas on the combustion chamber 3 side becomes lower than the pressure P2 on the air on the crankcase 4 side (P1 <P
In 2), the combustion gas in the piston body 8 passes through the communication passage 21,
The air is sucked into the combustion chamber 3 via the second annular space 20 and the first annular space 19. Therefore, according to the present embodiment, the second
The oil F rising to the annular space 20 of the combustion chamber 3
It is prevented from being carried to the side, and unnecessary consumption of the oil F due to combustion can be prevented. (Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIGS.

In this embodiment, instead of the notch 22, a groove 2 is formed in the inner wall 11b of the oil ring groove 11 on the combustion chamber 3 side.
3 is different from the fifth embodiment. The groove 23 extends from the third land 18 to the axis A of the piston body 8.
, And reaches a position deeper than the oil ring groove 11. The surface 23 b of the groove 23 on the combustion chamber 3 side is substantially parallel to the oil ring 14. And FIG.
As shown by 6, a communication path 21 is formed by the groove 23, a part of the oil ring groove 11, and the slit 15.

Therefore, according to the present embodiment, the groove 23 extends to a position deeper than the oil ring groove 11 in addition to the operation and effect similar to those of the fifth embodiment. The movement of the combustion gas and the air between the piston ring and the inside of the piston body 8 is smoothly performed without being interrupted by the oil ring 14. (Seventh Embodiment) Next, a seventh embodiment of the present invention will be described with reference to FIGS. In this embodiment, the communication path 21
Is opened at the boundary between the inner wall 10a of the second ring groove 10 on the side of the crankcase 4 and the third land 18, which is different from the first embodiment.

Accordingly, in the present embodiment, as in the first embodiment, the oil F that has entered the second annular space 20 is prevented from moving toward the combustion chamber 3 and an increase in oil consumption can be prevented. . (Eighth Embodiment) Next, an eighth embodiment of the present invention will be described with reference to FIG. In this embodiment, one end of the communication passage 21 is
The difference from the first embodiment is that the top ring groove 9 is opened at the inner wall 9a on the crankcase 4 side. In this case, even if the oil F enters the first annular space 19, the oil F is prevented from moving toward the combustion chamber 3 and an increase in oil consumption can be prevented. (Ninth Embodiment) Next, a ninth embodiment of the present invention will be described with reference to FIG. In this embodiment, one end of the communication passage 21 is opened by the third land 18 and the other end is opened by the second land 17.
This is different from the first embodiment in that the opening is provided at the point.
That is, one end of the communication path 21 is opened in the second annular space 20 and the other end is opened in the first annular space 19.

Therefore, according to the present embodiment, the third embodiment is performed only when the pressure P1 of the combustion gas in the combustion chamber 3 becomes lower than the pressure P2 of the air in the crankcase 4 (P1 <P2). The same operation and effect as those described above can be obtained.

The present invention is not limited to the configuration of the above-described embodiment, and may be arbitrarily changed without departing from the spirit of the present invention, for example, as follows. (1) The number and shape of the communication passages 21 are not particularly limited as long as both ends of the communication passage 21 are opened above the oil storage portion B.

(2) In the first and second embodiments, one end of the communication passage 21 is opened by the third land 18 of the piston body 8. However, as shown in FIGS. 21 and 22,
One end of each of the communication passages 21 may be opened at the second land 17 facing the first annular space 19.

(3) In the third and fourth embodiments, the notch 22 and the groove 23 are formed in the inner wall 10a of the second ring groove 10 on the side of the crankcase 4, but as shown in FIG. The notch 22 may be formed on the inner wall 9a of the top ring groove 9 on the crankcase 4 side, or the groove 23 may be formed on the inner wall 9a of the top ring groove 9 on the crankcase 4 side, as shown in FIG. .

(4) In the fifth and sixth embodiments, the notch 22 and the groove 23 are formed in the inner wall 10b of the oil ring groove 11 on the side of the combustion chamber 3, but as shown in FIG. The groove 22 may be formed on the inner wall 10b of the second ring groove 10 on the combustion chamber 3 side, or the groove 23 may be formed on the inner wall 10b of the second ring groove 10 on the combustion chamber 3 side as shown in FIG.

(5) In the seventh embodiment, one end of the communication passage 21 is opened at the boundary between the inner wall 10a of the second ring groove 10 on the crankcase 4 side and the third land 18, as shown in FIG. One end of the communication passage 21 is opened at the boundary between the inner wall 11b of the oil ring groove 11 on the combustion chamber 3 side and the third land 18, or one end of the communication passage 21 is connected to the second ring groove as shown in FIG. The opening may be formed at the boundary between the inner wall 10 b of the combustion chamber 3 and the second land 17.

(6) In the ninth embodiment, one end of the communication passage 21 is opened by the third land 18 and the other end is opened by the second land 17, but as shown in FIG. One end may be opened by the second land 17 and the other end may be opened by the top land 16. In this case,
One end of the communication passage 21 opens in the first annular space 19, and the other end opens in the combustion chamber 3.

(7) As shown in FIGS. 30 and 31, a check valve structure may be added to the communication passage 21 of the first embodiment. The check valve structure of FIG. 30 includes a reed valve 31 that opens and closes the communication passage 21 from the inner surface side of the piston body 8 and a valve fixing screw 32 that fixes the reed valve 31 to the inner surface of the piston body 8. The check valve structure in FIG.
The ball valve 33 is provided in the middle of the communication passage 21 and a spring 34 for urging the ball valve 33 toward the outer peripheral surface of the piston body 8. In each case, the second
The flow of gas from the annular space 20 into the piston body 8 is allowed, and the flow of gas, oil, and the like from inside the piston body 8 to the second annular space 20 is prevented.

Therefore, oil splashed by the rotational movement of the crankshaft 6 and oil scattered on the inner surface of the piston main body 8 by an oil jet or the like are generated by the communication passage 2.
1 is blocked by the above-described check valve structure. Thereby, the amount of oil in the second annular space 20 can be suppressed.

(8) The present invention may be embodied in a piston in which two or more piston rings are mounted on the outer periphery of the piston body 8.

[0047]

As described in detail above, according to the present invention ,
Considering the special characteristics of the runt engine, the slant engine
Since the communication passage for optimal gas distribution is provided, the piston
There is an excellent effect that oil staying in the outer annular space is prevented from moving to the combustion chamber side, thereby preventing an increase in oil consumption.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a piston and a cylinder for a slant engine according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a part of the thrust engine according to the first embodiment.

FIG. 3 is a front view of a piston according to the first embodiment.

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

FIG. 5 is a graph showing a relationship between an engine speed and oil consumption in the first embodiment.

FIG. 6 is a partial sectional view of a piston and a cylinder in a second embodiment.

FIG. 7 is a partial sectional view of a piston and a cylinder in a third embodiment.

FIG. 8 is a partial cross-sectional view near a second ring for explaining a flow of a combustion gas in a third embodiment.

FIG. 9 is a partial perspective view of a piston body near a notch in a third embodiment.

FIG. 10 is a partial sectional view of a piston and a cylinder in a fourth embodiment.

FIG. 11 is a partial cross-sectional view near a second ring for explaining a flow of a combustion gas in a fourth embodiment.

FIG. 12 is a partial perspective view of a piston body near a groove in a fourth embodiment.

FIG. 13 is a partial sectional view of a piston and a cylinder in a fifth embodiment.

FIG. 14 is a partial cross-sectional view showing the vicinity of an oil ring for explaining a flow of a combustion gas in a fifth embodiment.

FIG. 15 is a partial sectional view of a piston and a cylinder in a sixth embodiment.

FIG. 16 is a partial sectional view near an oil ring for explaining a flow of a combustion gas in a sixth embodiment.

FIG. 17 is a partial sectional view of a piston and a cylinder in the seventh embodiment.

FIG. 18 is a partial perspective view of a piston body near a communication passage according to a seventh embodiment.

FIG. 19 is a partial sectional view of a piston and a cylinder in the eighth embodiment.

FIG. 20 is a partial sectional view of a piston and a cylinder in a ninth embodiment.

FIG. 21 is a partial sectional view around a piston showing another example of the communication passage in the first embodiment.

FIG. 22 is a partial sectional view around a piston showing another example of the communication passage in the second embodiment.

FIG. 23 is a partial sectional view around a piston showing another example of the communication passage in the third embodiment.

FIG. 24 is a partial sectional view around a piston showing another example of the communication passage in the fourth embodiment.

FIG. 25 is a partial sectional view around a piston showing another example of the communication passage in the fifth embodiment.

FIG. 26 is a partial sectional view around a piston showing another example of the communication passage in the sixth embodiment.

FIG. 27 is a partial sectional view around a piston showing another example of the communication passage in the seventh embodiment.

FIG. 28 is a partial sectional view around a piston showing another example of the communication passage in the seventh embodiment.

FIG. 29 is a partial sectional view around a piston showing another example of the communication passage in the ninth embodiment.

FIG. 30 is a partial cross-sectional view around the piston showing a state in which a check valve structure is added to the communication passage of the first embodiment.

FIG. 31 is a partial cross-sectional view around the piston showing a state in which a check valve structure is added to the communication passage of the first embodiment.

FIG. 32 is a partial front view of a conventional piston.

FIG. 33 is a partial cross-sectional view of a piston and a cylinder in the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Slant engine, 2 ... Cylinder, 3 ... Combustion chamber, 4
... Crankcase, 8 ... Piston body, 12 ... Top ring forming a piston ring, 13 ... Second ring forming a piston ring, 14 ... Oil ring forming a piston ring, 19 ... First annular space, 20 ... No. 2 annular space, 21: communication passage, B: oil storage portion, F
... oil, L ... vertical line

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Kimitaka Saito 14 Iwatani, Shimowakaku-cho, Nishio-shi, Aichi Co., Ltd. Inside the Japan Automobile Parts Research Laboratory (56) References 59-68161 (JP, U) Japanese Utility Model 1981-83611 (JP, U) Japanese Utility Model Application Hei 3-89959 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02F 3/00 F01M 1/06

Claims (1)

(57) [Claims] 1. A pit is installed in an inclined state with respect to a vertical line.
Multiple piston rings are separated from each other around the
Each piston on the outer peripheral side of the piston body
Oil stays below the annular space defined by the ring.
The slanted engine piston
One end of the body is from the part where the oil in the annular space stays
Also open to the upper part, the other end is
Also open in a space different from the annular space in the upper part
Pipes for slant engines with communication passages for gas distribution
Ston.