CN110410229A - Piston lubricating structure - Google Patents
Piston lubricating structure Download PDFInfo
- Publication number
- CN110410229A CN110410229A CN201910328521.2A CN201910328521A CN110410229A CN 110410229 A CN110410229 A CN 110410229A CN 201910328521 A CN201910328521 A CN 201910328521A CN 110410229 A CN110410229 A CN 110410229A
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- China
- Prior art keywords
- hole
- piston
- skirt section
- thrust
- slot
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
A kind of piston, including at least one first through hole in the first skirt section in terrace part, slot, thrust sides, the second skirt section in propulsive thrust side, axle portion, thrust sides and the second through-hole in propulsive thrust side.First skirt section and the second skirt section extend on the vibration-direction of piston from the peripheral surface of terrace part.First skirt section and the second skirt section facing each other in radial directions.Axle portion is arranged between the first skirt section and the second skirt section, and orthogonal with the vibration-direction of piston.The component of reciprocating motion of the pistons is set to be rotatably connected to axle portion.First through hole passes through terrace part from slot.Second through-hole passes through terrace part from slot.First through hole is arranged in along circumferential direction between the first skirt section and axle portion.Second through-hole is arranged in the range of the second skirt section extends along circumferential direction.
Description
Technical field
The present invention relates to a kind of piston lubricating structures that the cylinder along internal combustion engine moves back and forth.
Background technique
In internal combustion engine, by the rotary motion for reciprocating through connecting rod and being converted into crankshaft of piston in the cylinder, with right
Vehicle generates driving force.Piston is contacted by oil with the inner wall of cylinder.Oil ring in the oil ring groove of piston is set to from cylinder
Inner wall wipes extra oil off.Way to cycle oil is formed in oil ring groove so that extra oil return to cylinder crank box (for example,
See patent document 1).In this way, forming oil film between piston and the inner wall of cylinder.
Patent document: JP-A-2001-329909
When reciprocating motion of the pistons, the inner wall of cylinder receives extruding force (thrust) from piston.Pass through the reciprocal fortune in piston
It is formed between dynamic direction (vertical direction of cylinder) and the swaying direction (from the inclined direction of vertical direction of cylinder) of connecting rod
Angle generates thrust in piston outward in the radial direction.
Thrust is influenced by the swing angle, internal cylinder pressure and inertia force of connecting rod, and according to the angle of crankshaft, rotation
Turn number and engine loading and change.When thrust changes, the thickness of the oil film between cylinder and piston changes.Work as thrust
When larger, the thickness of oil film may be insufficient.
Summary of the invention
This disclosure relates to which a kind of piston lubricating structure, can form oil film appropriate between piston and cylinder to provide profit
It is sliding.
According to one or more embodiments, piston includes terrace part, slot, the first skirt section in thrust sides, propulsive thrust side
In the second skirt section, axle portion, at least one first through hole in thrust sides and the second through-hole in propulsive thrust side.First skirt
Portion and the second skirt section extend on the vibration-direction of piston from the peripheral surface of terrace part.First skirt section and the second skirt section
It is facing with each other in radial directions.Axle portion is arranged between the first skirt section and the second skirt section, and the reciprocating motion side with piston
To orthogonal.The component of reciprocating motion of the pistons is set to be rotatably connected to axle portion.First through hole passes through terrace part from slot.Second is logical
Hole passes through terrace part from slot.First through hole is arranged in along circumferential direction between the first skirt section and axle portion.The setting of second through-hole exists
In the range of second skirt section extends along circumferential direction.
According to these embodiments, piston lubricating structure can form oil film appropriate between piston and cylinder to provide profit
It is sliding.
Detailed description of the invention
Fig. 1 is to show the schematic diagram for the internal combustion engine for being provided with the piston according to one embodiment.
Fig. 2 is to show the side view of piston.
Fig. 3 is to show the bottom view of piston.
Fig. 4 is the perspective view shown in below piston.
Fig. 5 is the cross-sectional view that the line F5-F5 along Fig. 4 of piston is intercepted.
Fig. 6 is the cross-sectional view of piston cut in a manner of exposing the thrust side through hole and propulsive thrust side through hole in Fig. 4.
Fig. 7 is to show the cross-sectional view of the region F7 including the thrust side through hole in Fig. 6 of piston.
Fig. 8 is to show the cross-sectional view of the region F8 including the propulsive thrust side through hole in Fig. 6 of piston.
Fig. 9 is to show the schematic diagram of the oil lubrication state in the skirt section relative to piston.
Figure 10 is the bottom view according to the piston of embodiment variant 1.
Figure 11 is the bottom view according to the piston of embodiment variant 2.
Specific embodiment
" embodiment "
" construction of internal combustion engine 1 "
The construction of internal combustion engine 1 will be described referring to figs. 1 to Fig. 7.
As shown in Figure 1, internal combustion engine 1 is a kind of device for for example generating driving force to vehicle.Internal combustion engine 1 passes through mixed gas
The explosive combustion of (fuel and air) generates thermal energy.Internal combustion engine 1 converts thermal energy into mechanical energy (burning load).It is negative by burning
Lotus rotates the crankshaft C of the crankshaft 15 for the drive member for being connected to tire.Internal combustion engine 1 includes the piston 11 for arriving oil ring 21 below.
Piston 11 moves up and down (reciprocating motion) along cylinder 12.As shown in Figure 1, inner wall (the cylinder of piston 11 and cylinder 12
Cover 12e) contact.In four-stroke engine, whenever occurring mixed gas (fuel and air) in the combustion chamber 12a in cylinder 12
Explosive combustion when, piston 11 move up and down so that cylinder 12 cylinder sleeve 12e move back and forth twice.
In crank structure clockwise for example shown in FIG. 1, when piston 11 moves down, piston pin 14 will be connected to
Connecting rod 13 is pushed to lower right under upper left in Fig. 1.Meanwhile in crank structure clockwise, when piston 11 is to moving up
When dynamic, piston 11 is pushed to upper right side from the lower left in Fig. 1 by the connecting rod 13 by being connected to piston pin 14.Below will
The details of piston 11 is described.
Cylinder 12 accommodates piston 11 in such a way that piston 11 can be moved back and forth vertically.As shown in Figure 1, combustion chamber 12a
It is formed in the cylinder 12 on the upside U of piston 11.Inlet channel 12b supplies mixed gas (fuel and sky to combustion chamber 12a
Gas).After the explosive combustion of mixed gas (fuel and air), exhaust gas is discharged from combustion chamber 12a in exhaust pathway 12c.
The crank box 12d (oil sump) of cylinder 12 is rotatably received in the interlocking connecting rod 13 of piston 11 and crankshaft 15
In.Oily EO is stored in the lower part of crank box 12d.Although using the engine of wet sump type in this embodiment,
The engine of dry slot type can be used.When using dry slot type engine when, the oily EO fallen from piston 11 be stored in
In the separated case of crankcase, and cylinder sleeve 12e is supplied to by oil pump.
The cylinder sleeve 12e of cylinder 12 is contacted by oil EO with piston 11.In this embodiment, by crankshaft 15 from crank box
12d scrapes the EO to cylinder sleeve 12e (so that oil splashes down) that deoils, and is supplied to cylinder sleeve 12e.The Supply Method of oily EO is unrestricted.
It and thus in another scenario, can be by the way that oily EO be ejected into cylinder sleeve 12e with fuel reserve tank or the independent mechanism of crank box 12d,
It is supplied to cylinder sleeve 12e.
The vertical motion of piston 11 is converted into rotary motion by connecting rod 13.As shown in Figure 1, connecting rod 13 is accommodated in cylinder 12
Crank box 12d in.The top of connecting rod 13 is inserted into the inner space 11u of piston 11.What is formed on the top of connecting rod 13 is small
End 13a is rotatably connected to piston pin 14.The big end 13b formed on the lower part of connecting rod 13 is rotatably connected to song
The crank-pin 15b of axis 15.
Piston pin 14 is rotatably connected to piston 11 and connecting rod 13.As shown in Figure 1, piston pin 14 passes through the pin of piston 11
Hole 11v is inserted into the small end 13a of connecting rod 13.
The reciprocating motion of connecting rod 13 is transmitted to the crankshaft C of crankshaft 15 by crankshaft 15.Crankshaft 15 is rotated and is scraped towards piston 11
Remove the oily EO being stored in the crank box 12d of cylinder 12.As shown in Figure 1, crankshaft 15 is accommodated in the crank box 12d of cylinder 12
In.The center portion 15a of crankshaft 15 is connected to crankshaft C.The crank-pin 15b of crankshaft 15 is rotatably connected to the big end of connecting rod 13
Portion 13b.
Intake valve 16 allows the inlet channel 12b flowing in combustion chamber 12a of mixed gas (fuel and air) from cylinder 12.Such as
Shown in Fig. 1, intake valve 16 is arranged between the inlet channel 12b of cylinder 12 and combustion chamber 12a.
Exhaust gas is discharged to exhaust passage 12c from the combustion chamber 12a of cylinder 12 by exhaust valve 17.As shown in Figure 1, exhaust valve 17
It is arranged between the exhaust passage 12c of cylinder 12 and combustion chamber 12a.
Mixed gas (fuel and air) in the combustion chamber 12a of 18 gas cylinders 12 of spark plug is to execute explosive combustion.
As shown in Figure 1, spark plug 18 is opposite with the combustion chamber 12a of cylinder 12.Spark plug 18 is for compression-ignited autogenous ignition engine (example
Such as diesel engine) it is not required in that.
Gap between piston 11 and the cylinder sleeve 12e of cylinder 12 is by apical ring 19 (the first compression ring) sealing.In other words, it pushes up
The mixed gas (fuel and air) for the combustion chamber 12a for being supplied to cylinder 12 is maintained in the 12a of combustion chamber by ring 19.Such as Fig. 1 and
Shown in Fig. 7, apical ring 19 is attached to the terrace part 11A of piston 11.
Second ring 20 (the second compression ring) aids in apical ring 19.The cylinder sleeve 12e of second ring 20 regulating piston 11 and cylinder 12
Between oily EO thickness.As shown in Figure 1 and Figure 7, the second ring 20 is attached under the apical ring 19 in the terrace part 11A of piston 11
Side.In this embodiment, compression ring is made of two components, the two components include the first compression ring and second compresses ring, but
It is that the first compression ring and the second compression ring also may be integrally formed as single component.
When piston 11 moves down, oil ring 21 (oil-control ring) will be more between piston 11 and the cylinder sleeve 12e of cylinder 12
Remaining oily EO is scraped in crank box 12d.As shown in Figure 1 and Figure 7, oil ring 21 is attached in the terrace part 11A of piston 11
Two rings, 20 lower section.As shown in fig. 7, oil ring 21 includes upper rail 21a, lower railway 21b and gasket 21c.By gasket 21c by upper rail
The cylinder sleeve 12e of road 21a and lower railway 21b towards cylinder 12 is squeezed.In this embodiment, oil ring 21 is made of three components, this
Three components include upper rail 21a, lower railway 21b and gasket 21c (three-piece construction), but these components also may be integrally formed
Into two components (two-part construction).
" thrust generated in the component of internal combustion engine 1 "
Reference Fig. 1 is described to the thrust generated in the component of internal combustion engine 1.
As shown in Figure 1, passing through vertical (reciprocating motion) direction H1 (vertical direction of cylinder 12) in piston and connecting rod 13
Swaying direction H2 (from the inclined direction of vertical direction of cylinder 12) between the angle that is formed, piston 11 in the radial direction
Thrust is generated outward.When piston 11 moves downward or upward, the cylinder sleeve 12e of cylinder 12 is received radially outward from piston 11 to be pushed away
Power.Certainly, the swing angle of connecting rod 13 shown in FIG. 1 is an example, and is changed according to degree in crank angle.
Here, piston 11 receives burning load, and for example moves down in combustion stroke.At this point, piston 11 is in cylinder
It moves down in set 12e so that connecting rod 13 is reduced to lower right from the upper left side in Fig. 1.Piston 11 passes through in insertion pin hole 11v
Piston pin 14 be connected to the small end 13a of connecting rod 13.Therefore, as shown in Figure 1, passing through the vertical direction H1 and connecting rod of piston 11
Relationship between 13 swing angle generates thrust in piston 11 outward in the radial direction.Made using the pin hole 11v of piston 11
For reference, terrace part 11A is tilted to the left in Fig. 1.Therefore, it is applied to the thrust P1 of thrust sides TS (thrust sides cylinder sleeve 12e1)
Greater than the propulsive thrust P2 for being applied to propulsive thrust side ATS (propulsive thrust side cylinder sleeve 12e2).
As a result, the relatively large thrust P1 of terrace part 11A squeezes thrust sides cylinder sleeve 12e1, and counter pushed away with relatively small
Power P2 squeezes propulsive thrust side cylinder sleeve 12e2.Thrust sides cylinder sleeve 12e1 is the continuous cylinder sleeve in whole circumference along circumferential direction
A part of 12e, and it is more opposite with thrust sides TS (left side in Fig. 1) than the pin hole 11v of piston 11.Propulsive thrust side 12e2 is
A part of continuous cylinder sleeve 12e in whole circumference along circumferential direction, and than the pin hole 11v of piston 11 more with propulsive thrust
Side ATS (right side in Fig. 1) is opposite.
Thrust loading is received in each circulation that the cylinder sleeve 12e of cylinder 12 recycles stroke at four.In four cyclic processes,
Thrust loading in combustion stroke (expansion stroke) is relative maximum.Therefore, it receives since the burning in combustion stroke is negative
The side (thrust sides cylinder sleeve 12e1) of thrust caused by lotus is commonly known as thrust sides.
" construction of piston 11 "
The construction of piston 11 will be described referring to figs. 1 to Fig. 8.
As shown in Fig. 2, piston 11 includes terrace part 11A, skirt section 11B and axle portion 11C.Terrace part 11A is along cylinder
12 cylinder sleeve 12e is moved up and down.Terrace part 11A has cylindrical peripheral surface, and is continuously formed along peripheral surface
There is the oil ring groove 11g that can accommodate oil ring 21.The swing of skirt section 11B reduction terrace part 11A.Skirt section 11B includes from platform part
Divide the peripheral surface extension of 11A and a pair of of skirt section of facing each other.Axle portion 11C is rotatably connected to connecting rod 13, which makes
Piston 11 moves up and down (reciprocating motion), by this to the piston pin 14 between skirt section, and just with the vertical direction of piston 11
It hands over.Piston 11 includes the upper surface 11d for arriving propulsive thrust side through hole 11x below.
Upper surface 11d receives the explosive combustion institute companion of the mixed gas (fuel and air) in the combustion chamber 12a of cylinder 12
With pressure.Piston 11 is moved down when receiving the pressure on the 11d of upper surface.As depicted in figs. 1 and 2, upper surface 11d is formed
In the upper end of piston 11.Upper surface 11d constitutes a part (lower part) of the combustion chamber 12a of cylinder 12.
Apical ring slot 11e accommodates apical ring 19.As shown in Figure 6 to 8, apical ring slot 11e is with continuous spill along terrace part 11A
Circumferential direction whole circumference on formed.Here, apical ring 19 terrace part 11A in the radial direction from apical ring slot 11e to
Outer stretching, and contacted with the cylinder sleeve 12e of cylinder 12.
Second annular groove 11f accommodates the second ring 20.As shown in Figure 6 to 8, the second annular groove 11f is with continuous spill along platform
It is formed in the whole circumference of the circumferential direction of part 11A.Second annular groove 11f is formed in below apical ring slot 11e.Here, the second ring
20 in the protruding from the second annular groove 11f in the radial direction of terrace part 11A, and contacts with the cylinder sleeve 12e of cylinder 12.
Oil ring groove 11g accommodates oil ring 21.As shown in Figure 6 to 8, oil ring groove 11g is with continuous spill along terrace part 11A
Circumferential direction whole circumference on formed.Oil ring groove 11g is formed in below the second annular groove 11f.Here, the upper rail of oil ring 21
21a and lower railway 21b is in the protruding from oil ring groove 11g in the radial direction of terrace part 11A, and the cylinder sleeve with cylinder 12
12e contact.
Concave portion 11g1 is the space for making oily EO circulation (recycling).Concave portion 11g1 has following propulsive thrust
The construction of the obstructed internally space 11u of side through hole 11x.As shown in the magnification region b of Fig. 9, concave portion 11g1 is being located at thrust
Have in oil ring groove 11g on side skirt portion 11n towards the local recessed shape in the side of the crank box 12d of cylinder 12.Concave portion
Point 11g1 is cut into semi-cylindrical shape, with (inside in radial directions) in the horizontal direction from the outer weekly form of cylinder 12
Face extends to the inner end (side wall) of oil ring groove 11g.By cutting the thrust sides inclined-plane formed on the periphery of oil ring groove 11g
11h1m forms concave portion 11g1.As shown in the region of the thrust sides TS in Fig. 9, concave portion 11g1, which is formed at, to be pushed away
On the center and two sides of oil ring groove 11g on power side skirt portion 11n.The shape of concave portion 11g1, quantity etc. are unrestricted.It can
The amount of the oily EO of circulation is limited by the way that depth of concave portion 11g1 etc. is arranged.
Oil stream path is formed between oil ring groove inclined-plane 11h and the cylinder sleeve 12e of cylinder 12.As shown in Figures 4 to 6, oily
Annular groove inclined-plane 11h be by oil ring groove 11g the lower end continuously cut along whole circumference along circumferential direction in radial direction
On the inclined-plane that is outwardly formed.Oil ring groove inclined-plane 11h is opposite with cylinder sleeve 12e along the circumferential direction.Oil ring groove inclined-plane 11h can be configured to
It is identical in whole circumference (a circle circumference) along circumferential direction.Here, as shown in Figure 7 and Figure 8, about oil ring groove inclined-plane
11h, the thrust sides inclined-plane 11h1 on thrust sides TS can be than the propulsive thrust skew back face 11h2 on the ATS of propulsive thrust side
Greatly.In other words, about oil ring groove inclined-plane 11h, thrust sides inclined-plane 11h1 shown in Fig. 7 can relatively more relative to radial direction
It is long, and propulsive thrust skew back shown in Fig. 8 face 11h2 can be relatively much shorter relative to radial direction.Pass through this construction, thrust sides
A part of inclined-plane 11h1 has relatively bigger oil duct region, and a part of propulsive thrust skew back face 11h2 has relatively more
Small oil duct region.Thrust sides inclined-plane 11h1 and propulsive thrust skew back face 11h2 is continuous along the circumferential direction of oil ring groove 11g.
First platform 11i (roof panel) is opposite with the cylinder sleeve 12e of cylinder 12 by oil EO.As shown in Figure 2 and Figure 7, first
Platform 11i is the peripheral surface between the upper end and apical ring slot 11e of terrace part 11A.
Second platform 11j is opposite with the cylinder sleeve 12e of cylinder 12 by oil EO.As shown in Figure 2 and Figure 7, the second platform 11j is
Peripheral surface between apical ring slot 11e and the second annular groove 11f.
Third platform 11k is opposite with the cylinder sleeve 12e of cylinder 12 by oil EO.As shown in Figure 2 and Figure 7, third platform 11k is
Peripheral surface between the second annular groove 11f and oil ring groove 11g.
4th platform 11m is opposite with the cylinder sleeve 12e of cylinder 12 by oil EO.As shown in Figure 3 and Figure 4, the 4th platform 11m is
Peripheral surface between oil ring groove 11g and the first side wall part 11s.Or as shown in Figure 3 and Figure 4, the 4th platform 11m is
Peripheral surface between oil ring groove 11g and second sidewall part 11t.
When piston 11 moves up, thrust sides skirt section 11n prevents terrace part 11A from swinging.As shown in Figure 3 and Figure 4, it pushes away
Power side skirt portion 11n is formed along the thrust sides cylinder sleeve 12e1 of cylinder 12 with arc.Thrust sides skirt section 11n is from terrace part 11A's
Thrust sides TS extends towards lower dead center.Thrust sides skirt section 11n is contacted by oil EO with thrust sides cylinder sleeve 12e1, and on move down
It is dynamic.Here, when applying inertia loading in compression stroke, by being connected to the connecting rod 13 of piston pin 14 for piston 11 from Fig. 1
In lower left be moved upwards up to upper right side.At this point, thrust sides skirt section 11n receives moment of flexure load etc. around piston pin 14, and
And the thrust sides cylinder sleeve 12e1 of cylinder 12 is contacted by oil EO.In this way, preventing terrace part 11A from tilting at the center of piston pin 14
To the right side of Fig. 1.
When piston 11 moves down, propulsive thrust side skirt portion 11p prevents terrace part 11A from swinging.As shown in Figure 3 and Figure 4,
Propulsive thrust side skirt portion 11p is formed along the propulsive thrust side cylinder sleeve 12e2 of cylinder 12 with arc.Propulsive thrust side skirt portion 11p is from platform part
The propulsive thrust side ATS of 11A is divided to extend towards lower dead center.Propulsive thrust side skirt portion 11p is connect by oil EO and propulsive thrust side cylinder sleeve 12e2
Touching, and move up and down.Here, when applying burning load in combustion stroke, piston 11 is moved down with the company of pushing down on
It is connected to the connecting rod 13 of piston pin 14.At this point, propulsive thrust side skirt portion 11p receives moment of flexure load etc. around piston pin 14, and connect
Touch the propulsive thrust side cylinder sleeve 12e2 of cylinder 12.In this way, preventing terrace part 11A from tilting to a left side of Fig. 1 at the center of piston pin 14
Side.
When piston 11 moves down, thrust sides lower end 11q promotes for oily EO to be supplied to thrust sides skirt section 11n.Therefore, such as
Shown in Fig. 2, Fig. 3 and Fig. 6, thrust sides are formed by the way that camber is cut in the lower end of thrust sides skirt section 11n along the circumferential direction
Lower end 11q.Here, when piston 11 moves down, oily EO is stored in the thrust sides cylinder sleeve of thrust sides lower end 11q Yu cylinder 12
Between 12e1.When piston 11 moves down, oil EO is supplied between thrust sides skirt section 11n and thrust sides cylinder sleeve 12e1.
When piston 11 moves down, propulsive thrust side lower end 11r promotes for oily EO to be supplied to propulsive thrust side skirt portion 11p.Cause
This is formed as shown in Fig. 2, Fig. 3 and Fig. 6 by the way that camber is cut in the lower end of propulsive thrust side skirt portion 11p along the circumferential direction
Propulsive thrust side lower end 11r.Here, when piston 11 moves down, oily EO is stored in propulsive thrust side lower end 11r and cylinder 12
Between the cylinder sleeve 12e2 of propulsive thrust side.When piston 11 moves down, propulsive thrust side skirt portion 11p and propulsive thrust side cylinder sleeve 12e2 it
Between supply oil EO.
The first side wall part 11s constitutes the side wall between thrust sides skirt section 11n and propulsive thrust side skirt portion 11p.Such as Fig. 3 and figure
Shown in 4, one end of the first side wall part 11s connection thrust sides skirt section 11n and one end of propulsive thrust side skirt portion 11p.The first side wall
Part 11s is not contacted with the cylinder sleeve 12e of cylinder 12.The center portion of the first side wall part 11s axially Z than the first side
Two side thickness of wall part 11s, and constitute axle portion 11C.
Second sidewall part 11t between thrust sides skirt section 11n and propulsive thrust side skirt portion 11p with the first side wall part
11s opposite mode forms side wall.As shown in Figure 3 and Figure 4, the other end of second sidewall part 11t connection thrust sides skirt section 11n
With the other end of propulsive thrust side skirt portion 11p.Second sidewall part 11t is not contacted with the cylinder sleeve 12e of cylinder 12.Second sidewall part
Axially Z is thicker than two sides of second sidewall part 11t for the center portion of 11t, and constitutes axle portion 11C.
Inner space 11u is by thrust sides skirt section 11n, the propulsive thrust side skirt portion 11p, the first side wall part in piston 11
The space that 11s and second sidewall part 11t is surrounded.Inner space 11u accommodates the top of connecting rod 13 shown in FIG. 1.Inner space
Oily EO is discharged from oil ring groove 11g by propulsive thrust side through hole 11x 11u.As shown in Figures 4 to 6, inner space 11u mainly from
The lower end of piston 11 is recessed towards upside U.Inner space 11u is opposite with the crank box 12d of cylinder 12.
The two sides of pin hole 11v support piston pin 14.As shown in Figures 2 and 3, axially Z passes through axle portion to pin hole 11v
11C.Component for moving up and down piston 11 is connected to pin hole 11v.The component is interlocked by piston pin 14 and piston 11
Connecting rod 13.
" construction of the thrust side through hole 11w of piston 11 "
The construction of the thrust side through hole 11w of piston 11 will be described.
Oily EO is discharged thrust side through hole 11w from a part on thrust sides TS of oil ring groove 11g.Such as Fig. 6 and Fig. 7 institute
Show, thrust side through hole 11w is arranged in circumferential direction between thrust sides skirt section 11n and axle portion 11C.Thrust side through hole 11w from
Oil ring groove 11g passes through terrace part 11A along the vertical direction H1 of piston 11.Thrust side through hole 11w passes vertically through oil ring groove
Gap between 11g and the lower end of terrace part 11A.In other words, as shown in Figure 3 and Figure 5, thrust side through hole 11w passes through the
Four platform 11m.
Such as in the accompanying drawings, thrust side through hole 11w is made of a pair of of through-hole.As shown in figure 3, a thrust side through hole 11w
Across a 4th platform 11m, adjacent in circumferential direction an end 11n1 of thrust sides skirt section 11n.Such as Fig. 3 institute
Show, another thrust side through hole 11w passes through another 4th platform 11m, with adjacent to thrust sides skirt section 11n in circumferential direction
The other end 11n2.In this way, thrust side through hole 11w is formed along continuous oil ring groove 11g in the whole circumference of circumferential direction
In a part, which outwards positions in the radial direction thrust sides skirt section 11n's, and than pin hole 11v in thrust sides TS
On more outward.Shape, the quantity of thrust side through hole 11w etc. are unrestricted.
As shown in Figure 6 and Figure 7, thrust side through hole 11w is at the position far from the 4th platform 11m and thrust sides inclined-plane 11h1
It is opened in oil ring groove 11g.In other words, thrust side through hole 11w is not contacted with the 4th platform 11m and thrust sides inclined-plane 11h1.
As shown in Figure 6 and Figure 7, the radially inner side face contact of thrust side through hole 11w and oil ring groove 11g, and from the following table of oil ring groove 11g
Extend facing towards the third platform 11k on the U of upside.In other words, it is cut and is pushed away in the mode opposite with the side surface of oil ring groove 11g
Power side through hole 11w.
" construction of the propulsive thrust side through hole 11x of piston 11 "
The construction of the propulsive thrust side through hole 11x of piston 11 will be described.
A part discharge oil EO on propulsive thrust side ATS of the propulsive thrust side through hole 11x from oil ring groove 11g.Propulsive thrust side
Through-hole 11x passes through above-mentioned concave portion 11g1 to inner space 11u.As shown in Figure 6 and Figure 8, propulsive thrust side through hole 11x setting exists
In the range of propulsive thrust side skirt portion 11p extension.The side that propulsive thrust side through hole 11x intersects along the vertical direction H1 with piston 11
Terrace part 11A is passed through to from oil ring groove 11g.Propulsive thrust side through hole 11x is horizontally through oil ring groove 11g and inner space 11u
Between gap.In other words, as shown in Figure 3 and Figure 5, propulsive thrust side through hole 11x horizontally leads to internal sky from oil ring groove 11g
Between 11u.
Such as in the accompanying drawings, propulsive thrust side through hole 11x is made of a pair of of through-hole.Propulsive thrust side through hole 11x is anti-for this pair of
It is formed on the two sides in circumferential direction of thrust sides skirt section 11p.In this way, propulsive thrust side through hole 11x is whole along circumferential direction
Formed in a part of continuous oil ring groove 11g on a circumference, the part on the ATS of propulsive thrust side more outwards than pin hole 11v
Positioning.Shape, the quantity of propulsive thrust side through hole 11x etc. are unrestricted.As shown in Figure 6 and Figure 8, propulsive thrust side through hole 11x and anti-
Thrust sides skirt section 11p and propulsive thrust skew back face 11h2 contact.In other words, propulsive thrust side through hole 11x is cut into propulsive thrust side
Skirt section 11p and propulsive thrust skew back face 11h2.
" major function of the lubrication system of piston 11 "
Reference Fig. 9 is described to the major function of piston 11.
As shown in the region on the thrust sides TS in Fig. 9, oily EO 1 refers to the oil flowed towards thrust sides skirt section 11n.
When piston 11 moves down, a part of the oily EO 1 on thrust sides TS is along the oil being located in the 4th platform 11m of this pair
Annular groove inclined-plane 11h is flowed towards thrust sides skirt section 11n.
As shown in the magnification region a in Fig. 9, oily EO 2 refers to not flowing into being slightly discharged in the 11n of thrust sides skirt section
Oil.Oily EO 2 is a part from the thrust side through hole 11w that the inflow that oily EO 1 is branched out is formed in oil ring groove 11g.Oil
The amount of EO 2 is very small compared with oily EO 1.When fuel to be mixed into oil ring groove 11 from combustion chamber 12a, discharge includes fuel
Oily EO 2 so that can prevent fuel flow into thrust sides skirt section 11n.Here, it thrust side through hole 11w and the 4th platform 11m and pushes away
Power skew back face 11h1 is not contacted.Therefore, thrust side through hole 11w can prevent oily EO 2 from flowing into the 4th platform 11m and thrust sides inclined-plane
11h1.Oil EO 2 is discharged from thrust side through hole 11w below the 4th platform 11m.
As shown in the magnification region a in Fig. 9, oily EO 3 refers to the oil of the sufficient amount flowed into the 11n of thrust sides skirt section.Oil
EO 3 is the major part branched out from oily EO 1.The amount of oily EO 3 is more slightly smaller than oily EO 1.Oily EO 3 is flowed towards thrust sides skirt section 11n
It moves and is supplied to thrust sides skirt section 11n.Here, thrust sides inclined-plane 11h1 is bigger than propulsive thrust skew back face 11h2.Oil ring groove 11g's
A part of formation thrust sides inclined-plane 11h1 has a part of the formation propulsive thrust skew back face 11h2 than oil ring groove 11g relatively more
Big oily EO aisle spare.Therefore, oily EO 3 is easily supplied to thrust sides skirt section 11n.
Preferably, it prevents oily EO 3 to be discharged from thrust sides skirt section 11n as far as possible, and holds it in thrust sides skirt section
In 11n.Therefore, as shown in the magnification region b of Fig. 9, make oily EO's 3 using the concave portion 11g1 being formed in oil ring groove 11g
A part (oily EO 3a and oil EO 3b) circulation.Specifically, oil EO 3a shown in the magnification region b of Fig. 9 and oil EO 3b direction
Oil ring 21 shown in Fig. 7 flows through concave portion 11g1.Oily EO 3a and oil EO 3b passes through upper rail 21a and lower railway 21b
Between gap oil ring 21 shown in Fig. 7 gasket 21c flow into oil ring groove 11g.By flow into oil ring groove 11g oily EO 3a and
Oily EO 3b is supplied to thrust sides skirt section 11n.In this way, in order to reuse the oily EO 3 in the 11n of thrust sides skirt section and as far as possible not
Discharge makes oily EO 3a and oil EO 3b be recycled to oil ring groove 11g by using concave portion 11g1 (it is not through-hole).
In the entire compression stroke of initial stage for including compression stroke, oily EO 3 can be maintained at thrust sides skirt section
In 11n.This is because oily EO 3 is existed in concave portion 11g1 other than thrust sides inclined-plane 11h1.In other words, make
The part (oily EO 3a and oil EO 3b) of oily EO 3 is recycled to thrust sides skirt section 11n from oil ring groove 11g by concave portion 11g1,
Fully to lubricate thrust sides skirt section 11n.In this way, oily 3 long-time of EO can be maintained at thrust sides in entire compression stroke
In the 11n of skirt section.
Fuel is hardly mixed with the oily EO 3 in the periphery of concave portion 11g1.In other words, fuel is in concave portion
It is sufficiently diluted in oil ring groove 11g in the periphery of 11g1.Therefore, it can be actively used for pushing away across the oily EO 3 of concave portion 11g1
The circulation of power side skirt portion 11n by fuel without being influenced.
Extra oily EO 3a and oil EO 3b due to that will be recycled to oil ring groove 11g are discharged from thrust side through hole 11w, institute
Oily EO 3a and oil EO 3b flowing in combustion chamber 12a can be prevented.As a result, when oil ring groove 11g is full of oil EO, it can be by from oil ring
Extra oily EO is discharged in slot 11g, to prevent oily EO from flowing into towards combustion chamber 12a, to prevent the efficiency of combustion in the 12a of combustion chamber
Decline.
Therefore, the oily EO 3 of enough amounts is supplied on the thrust sides TS for applying the thrust P1 with opposite high load capacity
Thrust sides skirt section 11n.As a result, can be formed between the thrust sides skirt section 11n of piston 11 and the thrust sides cylinder sleeve 12e1 of cylinder 12
Oil film appropriate, to provide lubrication.During the combustion stroke of internal combustion engine 1, oily EO 3 extends to thrust sides skirt section 11n and uniform
Ground expansion.Therefore, piston 11 can bear the high load capacity thrust P1 for being applied to thrust sides skirt section 11n.In other words, piston can be prevented
Metal between 11 thrust sides skirt section 11n and the thrust sides cylinder sleeve 12e1 of cylinder 12 contacts.
In thrust sides TS, thrust side through hole 11w far from the 4th platform 11m and oil ring groove inclined-plane 11h position at
It is opened in oil ring groove 11g.Therefore, the oil that thrust side through hole 11w is flowed into from the 4th platform 11m and oil ring groove inclined-plane 11h can be reduced
The amount of EO.As a result, the oily EO more fully measured can be supplied to thrust sides skirt section 11n.
On thrust sides TS, thrust side through hole 11W passes through lower end (the 4th platform of oil ring groove 11g and terrace part 11A
Gap between 11m).It therefore, can rapidly downwards when the oily EO for the oil ring groove 11g being located in the 11n of thrust sides skirt section is extra
Extra oily EO is discharged.It, can be from downside towards upside when the oily EO deficiency for the oil ring groove 11g being located in the 11n of thrust sides skirt section
Rapidly supply oil EO.As a result, thrust side through hole 11w can supply sufficient amount to the oil ring groove 11g being located in the 11n of thrust sides skirt section
Oily EO.
As shown in the region of the propulsive thrust side ATS of Fig. 9, oily EO 4 refers to the oil flowed towards propulsive thrust side skirt portion 11p.
Oily EO 4 is parked in the lower railway 21b of oil ring 21 shown in Fig. 8, and a part of the oily EO 4 on the ATS of propulsive thrust side along
Oil ring groove inclined-plane 11h in the 4th platform 11m of this pair is flowed towards propulsive thrust side skirt portion 11p.Here, oily EO 4 is anti-
It is easy to become extra in the 11p of thrust sides skirt section.Therefore, as described later herein, oily EO 4 is branched off into relatively large amount oil
Oily EO 5 and oily EO 6 with opposite small quantity of oil.Oily EO 5 is initiatively discharged.
As shown in the magnification region c of Fig. 9, oily EO 5 is the oil for not being supplied to propulsive thrust side skirt portion 11p and being discharged, anti-
It will not become extra in the 11p of thrust sides skirt section.The major part for the oily EO 4 being parked in the lower railway 21b of oil ring 21 is branched off into oily EO
5, and flow into the propulsive thrust side through hole 11x being formed in oil ring groove 11g.Here, propulsive thrust side through hole 11x and propulsive thrust side skirt
Portion 11p and propulsive thrust skew back face 11h2 contact.Therefore, oily EO 5 is easy from propulsive thrust side skirt portion 11p and propulsive thrust skew back face
11h2 flows into propulsive thrust side through hole 11x.Oily EO 5 is discharged to inner space 11u from propulsive thrust side through hole 11x.
As shown in the magnification region c of Fig. 9, oily EO 6 is the oil of minimum needed for propulsive thrust side skirt portion 11p.Oily EO 6
It is the fraction branched out from oily EO 4.Oily EO 6 towards propulsive thrust side skirt portion 11p center flow and be supplied.Here, instead
Thrust sides inclined-plane 11h2 specific thrust skew back face 11h1 is small.Therefore, oily EO 6 is difficult to be supplied to propulsive thrust side skirt portion 11p.
As a result, the oily EO 6 of required minimum to be supplied to the propulsive thrust side for applying the propulsive thrust P2 with opposite underload
Propulsive thrust side skirt portion 11p on ATS.The adjoint propulsive thrust P2 of inertia loading in compression stroke is than the burning in combustion stroke
The adjoint thrust P1 of load is much smaller.Therefore, the propulsive thrust side of piston 11 can be prevented by the oily EO 6 of required minimum
Metal between skirt section 11p and the propulsive thrust side cylinder sleeve 12e2 of cylinder 12 contacts.As a result, can be in the propulsive thrust side skirt portion of piston 11
Oil film appropriate is formed between 11p and the propulsive thrust side cylinder sleeve 12e2 of cylinder 12, to provide lubrication.Propulsive thrust side skirt portion 11p with
The gap on gap-ratio thrust sides TS between the cylinder sleeve 12e2 of propulsive thrust side is big, so that low friction is kept, without extra oil
EO is stopped.Thus it can reduce oil consumption.
" effect of the lubrication system of piston 11 "
The effect of the lubrication system of piston 11 will be described.
According to the present embodiment, thrust side through hole 11w be arranged in circumferential direction thrust sides skirt section 11n and axle portion 11C it
Between, and terrace part 11A is passed through from oil ring groove 11g.Propulsive thrust side through hole 11x setting extends from propulsive thrust side skirt portion 11p
In the range of, and terrace part 11A is passed through from oil ring groove 11g.Therefore, can the oily EO (oily EO 3) of sufficient amount be supplied to and is applied
Add the thrust sides skirt section 11n on the thrust sides TS of thrust P1.It, can be by institute meanwhile on the propulsive thrust side ATS for not applying thrust P1
The oily EO (oily EO 6) of minimum is needed to be supplied to propulsive thrust side skirt portion 11p.As a result, the shape between piston 11 and cylinder 12 can be passed through
Piston 11 is lubricated at oil film appropriate.
According to the present embodiment, thrust side through hole 11w is in the position far from peripheral surface (for example, the 4th platform 11m)
It is opened in oil ring groove 11g.Thrust side through hole 11w is not contacted with the 4th platform 11m.Therefore, it can reduce and be flowed into from the 4th platform 11m
The amount of the oily EO (oily EO 2) of thrust side through hole 11w.As a result, thrust sides skirt section can be supplied to the oily EO (oily EO 3) of sufficient amount
11n。
According to the present embodiment, oil ring groove 11g is formed with oil ring groove inclined-plane 11h, which passes through along circumferentially
The whole circumference in direction cuts outer end continuously in radial directions to be formed.About the area of oil ring groove inclined-plane 11h, thrust sides
On thrust sides inclined-plane 11h1 it is bigger than the propulsive thrust skew back face 11h2 on propulsive thrust side.Therefore, to the oily EO of thrust sides skirt section 11n
The supply of (oily EO 3) can be relatively bigger, and can be opposite to the supply of the oily EO of propulsive thrust side skirt portion 11p (oily EO 6)
It is smaller.As a result, thrust sides skirt section 11n can be supplied to the oily EO (oily EO 3) of sufficient amount.
According to the present embodiment, in oil ring groove 11g, towards the side of crank box 12d on the vibration-direction of piston 11
The recessed concave portion 11g1 in face is formed locally in the range of extending from thrust sides skirt section 11n.Concave portion 11g1 is from outer
Perimeter surface extends towards the inner end (side wall) of oil ring groove 11g.Therefore, it can prevent that oil EO is discharged from thrust sides skirt section 11n as far as possible
3, and oily EO 3 can be maintained in the 11n of thrust sides skirt section.As a result, thrust steadily can be supplied to the oily EO 3 of sufficient amount
Side skirt portion 11n.
" modification 1 "
In the piston 11 of modification 1 shown in Fig. 10, the thrust of the piston 11 of the quantity and embodiment of thrust side through hole 11w
The quantity of side through hole is different.
In the piston 11 of modification 1, on outside along circumferential direction part (Figure 10 of thrust sides skirt section 11n
In upside) in be formed with a thrust side through hole 11w.Meanwhile in the piston of modification 1 11, thrust sides skirt section 11n on edge
Thrust side through hole 11w there are three being formed in another part (downside in Figure 10) on the outside of circumferential direction.These three thrusts
Side through hole 11w is formed spaced apart to each other along the circumferential direction.
According to modification 1, between the side and the other side in the two sides of thrust sides skirt section 11n, the number of thrust side through hole 11w
Amount is different.In modification 1, thrust side through hole 11w thrust sides skirt section 11n along circumferential direction on outside on one
It is more than in another part in part.Therefore, the pressure of the oily EO flowed in oil ring groove 11g is on the edge of thrust sides skirt section 11n
It is higher than in another part in a part on the outside of circumferential direction.Along circumferential direction outer of 11n in thrust sides skirt section
One on side generates barometric gradient in the oily EO for flowing through oil ring groove 11g between part and another part.Therefore, oily EO holds
Easily it is flow to separately by oil ring groove 11g from a part (high-pressure side) on the outside along circumferential direction of thrust sides skirt section 11n
A part of (low-pressure side).As a result, the oily EO of sufficient amount can be steadily supplied to thrust sides skirt section 11n, and being easy will be extra
Oily EO from thrust side through hole 11w be discharged.
" modification 2 "
The piston 11 of modification 2 shown in Figure 11 and the piston 11 of embodiment are the difference is that this pair of of thrust sides through-hole
The size of 11w.
Part (Figure 11 in the piston 11 of modification 2, on the outside along circumferential direction of thrust sides skirt section 11n
In upside) in form the thrust side through hole 11w1 smaller than the thrust side through hole 11w of embodiment.Meanwhile in the piston of modification 2 11
In, it is formed in another part (downside in Figure 11) on the outside along circumferential direction of thrust sides skirt section 11n and compares embodiment
The big thrust side through hole 11w2 of thrust side through hole 11w.
According to modification 2, between the side and the other side in the two sides of thrust sides skirt section 11n, the ruler of thrust side through hole 11w
It is very little to be different.Thrust in modification 2, in a part on the outside along circumferential direction of thrust sides skirt section 11n
Side through hole 11w1 is smaller than the thrust side through hole 11w2 being located in another part.Therefore, oily EO is easy to pass through oil ring groove 11g from thrust
A part (high-pressure side) on the outside along circumferential direction of side skirt portion 11n flow to another part (low-pressure side).As a result, can
The oily EO of sufficient amount is steadily supplied to thrust sides skirt section 11n, and is easy to arrange extra oily EO from thrust side through hole 11w
Out.
These specific embodiments can be modified in various ways in the practice of the invention.
For example, in the above-described embodiments, it is assumed that piston 11 moves back and forth in the cylinder of internal combustion engine 12 along vertical direction
(moving up and down).Alternatively, piston 11 can move back and forth in the cylinder of internal combustion engine along horizontal direction etc..
As shown in the picture, in one or more embodiments and the first aspect of modification, piston 11 includes terrace part
11A, it the slot 11g for accommodating oil ring 21, the first skirt section 11n being set in thrust sides TS, is set in the ATS of propulsive thrust side
Second skirt section 11P, axle portion 11C, at least one first through hole 11W, 11W1, the 11W2 being set in thrust sides TS, and setting
The second through-hole 11X in the ATS of propulsive thrust side.Terrace part 11A has cylindrical peripheral surface.Slot 11g is along terrace part
The peripheral surface of 11A is continuously provided.First skirt section 11n and the second skirt section 11p is on the vibration-direction of piston 11 from flat
The peripheral surface of platform part 11A extends.First skirt section 11n and the second skirt section 11p facing each other in radial directions.Axle portion 11C
It is arranged between the first skirt section 11n and the second skirt section 11p, and orthogonal with the vibration-direction of piston 11.Keep piston 11 past
The component 13 moved again is rotatably connected to axle portion 11C.First through hole 11W, 11W1,11W2 pass through terrace part from slot 11g
11a.Second through-hole 11X passes through terrace part 11A from slot 11g.First through hole 11W, 11W1,11W2 are arranged in circumferential direction
Between first skirt section 11n and axle portion 11C.The range that the second skirt section 11p extends in circumferential direction is arranged in second through-hole 11X
It is interior.
In second aspect, in the piston 11 of first aspect, first through hole 11W, 11W1,11W2 are reciprocal piston 11
Terrace part 11A is passed through in the direction of motion, and the second through-hole 11X passes through terrace part 11A in radial directions.
In a third aspect, in the piston 11 of first aspect or second aspect, first through hole 11W, 11W1,11W2 are on edge
Radial direction is in slot 11g far from the position of peripheral surface to be opened.
In fourth aspect, in the piston 11 of one aspect of the first aspect into the third aspect, along circumferentially side
To whole circumference continuously cutting groove 11g outer end in radial directions, to form slot inclined-plane 11h.Slot inclined-plane 11h is being pushed away
Area on the TS of power side is greater than area of the slot inclined-plane 11h on the ATS of propulsive thrust side.
In the 5th aspect, in the piston 11 of one aspect of the first aspect into fourth aspect, in the past of piston 11
The concave portion 11g1 recessed towards crank box side in the multiple direction of motion, in the model that the first skirt section 11n extends in circumferential direction
It is locally formed in slot 11g in enclosing.Concave portion 11n extends from peripheral surface towards the inner end of slot 11g in radial directions.
In the 6th aspect, in the piston 11 of one aspect of the first aspect into the 5th aspect, first through hole 11W,
11W1,11W2 include one or more third through-hole 11W for being set on the side in circumferential direction of the first skirt section 11n with
And it is set to one or more fourth hole 11W on the other side in circumferential direction of the first skirt section 11n.Third through-hole
The quantity of 11W is different from the quantity of fourth hole 11W.
In the 7th aspect, in the piston 11 of one aspect of the first aspect into the 5th aspect, first through hole 11W,
11W1,11W2 include the third through-hole 11W2 being set on the side in circumferential direction of the first skirt section 11n and are set to
Fourth hole 11W1 on the other side in circumferential direction of first skirt section 11n.Third through-hole 11W2 is greater than fourth hole
11W1。
Reference signs list
1: internal combustion engine
11: piston
11A: terrace part
11B: skirt section
11C: axle portion
11d: upper surface
11e: apical ring slot
11f: the second annular groove
11g: oil ring groove (slot)
11g1: concave portion
11h: oil ring groove inclined-plane (slot inclined-plane)
11h1: thrust sides inclined-plane
11h2: propulsive thrust skew back face
11i: the first platform (peripheral surface)
11j: the second platform (peripheral surface)
11k: third platform (peripheral surface)
11m: the four platform (peripheral surface)
11n: thrust sides skirt section (the first skirt section)
11n1: one end
11n2: the other end
11p: propulsive thrust side skirt portion (the second skirt section)
11q: thrust sides lower end
11r: propulsive thrust side lower end
11s: the first side wall part
11t: second sidewall part
11u: inner space
11v: pin hole
11w, 11w1,11w2: thrust side through hole (first through hole, third through-hole, fourth hole)
11x: propulsive thrust side through hole (the second through-hole)
12: cylinder
12e: cylinder sleeve
12e1: thrust sides cylinder sleeve
12e2: propulsive thrust side cylinder sleeve
13: connecting rod (component for moving back and forth piston 11)
14: piston pin
15: crankshaft
16: intake valve
17: exhaust valve
18: spark plug
19: apical ring
20: the second rings
21: oil ring
EO, EO 1, EO 2, EO 3, EO 4, EO 5, EO 6: oil
P1: thrust
P2: propulsive thrust
TS: thrust sides
ATS: propulsive thrust side
T: thrust direction
AT: reverse thrust direction
U: upside
L: downside
Z:(pin hole 11v's) axial direction
C:(crankshaft 15) crankshaft
Claims (7)
1. a kind of piston lubricating structure, the piston in the piston lubricating structure is moved back and forth along the cylinder of internal combustion engine, described
Piston includes:
Terrace part；
Slot, the slot accommodate oil ring；
First skirt section, first skirt section are set in thrust sides；
Second skirt section, second skirt section are set in propulsive thrust side；
Axle portion；
At least one first through hole, the first through hole are set in the thrust sides；And
Second through-hole, second through-hole are set in the propulsive thrust side,
Wherein, the terrace part has cylindrical peripheral surface,
Wherein, the slot is continuously provided along the peripheral surface of the terrace part,
Wherein, first skirt section and second skirt section are on the vibration-direction of the piston from the terrace part
Peripheral surface extends, and first skirt section and second skirt section facing each other in radial directions,
Wherein, the axle portion is arranged between first skirt section and second skirt section, and the axle portion and the piston
Vibration-direction it is orthogonal,
Wherein, the component of the reciprocating motion of the pistons is made revolvably to be connected to the axle portion,
Wherein, the first through hole passes through the terrace part from the slot,
Wherein, second through-hole passes through the terrace part from the slot,
Wherein, the first through hole is arranged in along circumferential direction between first skirt section and the axle portion, and
Wherein, second through-hole is arranged in the range of second skirt section extends along circumferential direction.
2. piston lubricating structure according to claim 1, wherein the first through hole is in the reciprocating motion side of the piston
It is upward through the terrace part, and
Wherein, second through-hole passes through the terrace part in radial directions.
3. piston lubricating structure according to claim 1, wherein the first through hole is radially far from described outer
The position of perimeter surface, which is in the slot, opens.
4. piston lubricating structure according to claim 1, wherein the outer end in radial directions of the slot is along week
It is continuously cut to the whole circumference in direction, to form slot inclined-plane, and
Wherein, the slot inclined-plane is greater than area of the slot inclined-plane on the propulsive thrust side in the area in the thrust sides.
5. piston lubricating structure according to claim 1, wherein towards crank on the vibration-direction of the piston
The recessed concave portion in case side is locally formed in the slot in the range of first skirt section extends along circumferential direction, and
And
Wherein, the concave portion extends from the peripheral surface towards the inner end of the slot in radial directions.
6. piston lubricating structure according to any one of claim 1 to 5, wherein the first through hole includes being set to
One or more third through-holes on the side in circumferential direction in first skirt section and it is set to first skirt section
The other side in circumferential direction on one or more fourth holes, and
Wherein, the quantity of the third through-hole is different from the quantity of the fourth hole.
7. piston lubricating structure according to any one of claim 1 to 5, wherein the first through hole includes being set to
Third through-hole on the side in circumferential direction in first skirt section and be set to first skirt section in circumferential side
Fourth hole on the upward other side, and
Wherein, the third through-hole is greater than the fourth hole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018087005A JP7131058B2 (en) | 2018-04-27 | 2018-04-27 | Piston lubrication structure |
| JP2018-087005 | 2018-04-27 |
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| CN110410229A true CN110410229A (en) | 2019-11-05 |
| CN110410229B CN110410229B (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910328521.2A Active CN110410229B (en) | 2018-04-27 | 2019-04-23 | Piston lubricating structure |
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| Country | Link |
|---|---|
| JP (1) | JP7131058B2 (en) |
| CN (1) | CN110410229B (en) |
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| US5894824A (en) * | 1996-02-29 | 1999-04-20 | Unisia Jecs Corporation | Piston for internal combustion engines |
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| CN106194480A (en) * | 2015-05-25 | 2016-12-07 | 铃木株式会社 | The piston of internal combustion engine |
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| JPH0634152U (en) * | 1992-10-02 | 1994-05-06 | 株式会社ユニシアジェックス | Piston structure of internal combustion engine |
| JPH10141134A (en) * | 1996-11-11 | 1998-05-26 | Unisia Jecs Corp | Piston for internal combustion engine |
| JP2001329909A (en) | 2000-05-23 | 2001-11-30 | Aisin Seiki Co Ltd | Piston of engine |
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| US6935220B2 (en) | 2003-05-30 | 2005-08-30 | Bendix Commercial Vehicle Systems, Llc | Contoured piston |
| JP2010164030A (en) | 2009-01-19 | 2010-07-29 | Toyota Motor Corp | Internal combustion engine piston |
| JP2010164012A (en) | 2009-01-19 | 2010-07-29 | Suzuki Motor Corp | Piston for internal combustion engine |
| JP2012112376A (en) | 2010-11-04 | 2012-06-14 | Nippon Soken Inc | Piston for internal combustion engine, and internal combustion engine |
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2018
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|---|---|---|---|---|
| US5894824A (en) * | 1996-02-29 | 1999-04-20 | Unisia Jecs Corporation | Piston for internal combustion engines |
| CN2613607Y (en) * | 2003-04-23 | 2004-04-28 | 重庆宗申技术开发研究有限公司 | Piston of engine |
| CN2743561Y (en) * | 2004-11-17 | 2005-11-30 | 重庆宗申技术开发研究有限公司 | Piston |
| US7997249B2 (en) * | 2006-05-22 | 2011-08-16 | Toyota Jidosha Kabushiki Kaisha | Piston for internal combustion engine and internal combustion engine with the same |
| CN202578934U (en) * | 2012-03-29 | 2012-12-05 | 浙江吉利汽车研究院有限公司 | Automobile engine piston |
| CN106194480A (en) * | 2015-05-25 | 2016-12-07 | 铃木株式会社 | The piston of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7131058B2 (en) | 2022-09-06 |
| JP2019190445A (en) | 2019-10-31 |
| CN110410229B (en) | 2021-11-02 |
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