CN203515847U - Piston of internal combustion engine - Google Patents
Piston of internal combustion engine Download PDFInfo
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- CN203515847U CN203515847U CN201320356213.9U CN201320356213U CN203515847U CN 203515847 U CN203515847 U CN 203515847U CN 201320356213 U CN201320356213 U CN 201320356213U CN 203515847 U CN203515847 U CN 203515847U
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Abstract
The utility model discloses a piston of an internal combustion engine. The structure adopted in at least one coating (17) of a pair of lateral edge parts (10) comprises a groove part (26) and a groove part (31) which are provided with a guide-in channel (25) and a discharging channel (30) respectively. The guide-in channel (25) extends to the end, close to a piston head part (7), of a basic diameter part (11a) from the end, close to the piston head part (7), of the coating (17), and the discharging channel (30) is formed in the manner that in the external circumferential direction, the end of the basic diameter part of the guide-in channel is changed into the lower swinging ends of the coating (17). By means of the structure, the lubricating oil left on the wall of an air cylinder when a piston ascends flows downwards to the position near the basic diameter part from the lateral edge parts through the guide-in channel formed in the part, on the lateral edge part, of the coating. The flowing lubricating oil is temporarily held up in the intersection of the guide-in channel and the discharging channel. In the period of retention, the lubricating oil leaks into the part between the coating and the wall of the air cylinder, and accordingly an oil film is formed on the surface of the external circumference of the basic diameter part and the periphery of the surface.
Description
Technical field
The utility model relates to a kind of piston for internal-combustion engine, and more specifically, this piston that the utility model relates to comprises the coating on the outer surface of the side edge part that puts on this piston.
Background technique
Most of piston for internal-combustion engine adopts following structure: have for the circular piston head of compression ring and oil ring is installed thereon, and comprise pin-and-hole portion (attachment portion) and lateral margin, thereby this pin-and-hole portion is formed on the end that is rotatably connected to connecting rod (connecting rod) in this piston crown, this lateral margin forms from piston crown and extends.Now, in order to reduce the friction of piston, the piston crown being arranged in cylinder forms short cylindrical, and lateral margin is comprised of a pair of side edge part, this offside edge is only formed on the opposite side of piston crown, and crosses over the running shaft of pin-and-hole portion, thereby extends along cylinder wall surface.
Conventionally, in each side edge part, it is distolateral that base diameter is partly formed on the bottom of side edge part, the external diameter of the side edge part that this base diameter part makes progress in the footpath of piston is maximum, and shoulder part (shoulder section) is formed on the piston head side of base diameter part, the external diameter of this shoulder part is less than the external diameter of base diameter part.Here, because the piston for internal-combustion engine is rotatably connected to bent axle by connecting rod, when reciprocating motion of the pistons (by aspirating stroke, compression stroke, expansion stroke, exhaust stroke etc.), the base diameter of side edge part part and its peripheral easy cylinder wall surface that contacts.Therefore, now, by thering is the lubrication of greasy property, as molybdenum coating, put on the whole outer surface of side edge part, thereby improve it with respect to the greasy property of cylinder, to improve its serviceability.
Yet, when rising, piston (from lower dead center, to top dead center, advances), and at piston crown (having the part of compression ring and oil ring), through cylinder wall surface and after this cylinder wall surface is wiped lubricant oil off, side edge part is through cylinder wall surface.So, as a rule, because oil film is not formed in the coating putting on base diameter part and its peripheral outer surface rightly, thereby easily increase friction, and put on the easy variation of serviceability of the coating on base diameter part and its peripheral outer surface.Especially, when piston rises, at the side edge part of thrust side, the load of piston increases with respect to cylinder wall surface, and the friction of piston easily increases and the serviceability of coating easily reduces.
In order to overcome these deficiencies, for holding the groove part of lubricant oil, be formed on the coating (referring to PTL1 and 2) of the base diameter part of side edge part.
[reference listing]
Patent documentation
PTL1：JP-A-2009-30521
PTL2：JP-A-2010-156316
Model utility content
Yet, because PTL1 and 2 adopts following structure: lubricant oil is accommodated in the groove part being formed in coating, and the lubricant oil in groove part is directly supplied to the coating of base diameter part, when piston rises, lubricant oil in cylinder wall surface is less, thereby worries to obtain fully lubricant oil.This just propose a kind of may, the lubricant oil that is enough to form oil film can not be supplied to base diameter part and its outer coating of placing, thus the easy variation of the greasy property of coating and serviceability.
So a useful aspect of the present utility model, for a kind of piston for internal-combustion engine is provided, when this piston rises, can form rightly oil film in the base diameter part of its side edge part and the peripheral coating of its side edge part.
[solution]
According to an advantage of the present utility model, a kind of piston for internal-combustion engine is provided, comprising:
Piston crown, this piston crown is arranged in the cylinder of internal-combustion engine;
Joint, this joint is for being rotatably connected to piston crown by the end of connecting rod;
A pair of side edge part, this side edge part with respect to the spin axis of joint respectively the wall from the opposition side of piston crown along cylinder extend, the bottom end of this side edge part is arranged on the opposition side of piston crown; With
Coating, this coating puts on respectively on the outer surface of side edge part; Wherein
Each side edge part in a pair of side edge part comprises base diameter part and shoulder part, footpath at piston makes progress, the external diameter of this base diameter part is maximum in side edge part, this shoulder is partly arranged on than a side of the more close piston crown of base diameter part, and the external diameter of shoulder part is less than the external diameter of base diameter part; And
The coating putting at least one side edge part comprises groove part, this groove part has introduction channel and discharge route, this introduction channel extends to the boundary vicinity between shoulder part and base diameter part from coating in the end of piston crown side, and this discharge route extends to coating in the bottom distolateral end to displacement in the end of base diameter part side the peripheral direction at piston from introduction channel.
Introduction channel can be at the outer surface of the border between shoulder part and base diameter part and side edge part in the end of base diameter part side the infall of the center line in the peripheral direction at piston.
Discharge route can comprise at least two discharge routes, and with respect to the outer surface of side edge part, the center line in the peripheral direction of piston forms these at least two discharge routes symmetrically.
Groove part can be formed on a side edge part in side edge part, and when piston rises in cylinder, the surface pressure of this side edge part on cylinder increases.
The width of the first export department in peripheral direction can be less than the summation of the width of the second export department, this first export department at introduction channel near the end of base diameter part side, this second export department at peripheral direction discharge route near the distolateral end of the bottom of side edge part.
The width of the peripheral direction of the first export department can be greater than the summation of the width of the second export department, this first export department at introduction channel near the end of base diameter part side, this second export department at peripheral direction discharge route near the distolateral end of the bottom of side edge part.
The width of import department in peripheral direction can be greater than the width of the first export department, and this import department is at introduction channel near an end of piston crown side, and this first export department is near the other end of introduction channel.
Oil storage portion can form at the joint of introduction channel and discharge route a part for groove part, and oil storage portion is recess in the distolateral end of the bottom of side edge part, and this recess can be by by coating, the bottom concave end towards side edge part forms.
[beneficial effect of model utility]
According to the utility model, when piston rises, the lubricant oil being bonded in cylinder wall surface flows to introduction channel.The displacement of the position of utilization in the peripheral direction between introduction channel and discharge route, this lubricant oil can temporarily be trapped near the boundary between shoulder part and base diameter part, and, when being detained, oil leak is between base diameter part and its peripheral coating and cylinder wall surface.Due to this structure, the lubricant oil being bonded in cylinder wall surface can at least form rightly oil film in base diameter part and its peripheral coating.That is, utilize indirect oil film formation technology to guide lubricant oil directly over base diameter part, oil film can be formed in base diameter part and its peripheral coating rightly.
So, in the ascending motion of piston, can guarantee the greasy property of base diameter part and its peripheral coating, thereby can reduce the friction of piston.And, can also improve the serviceability of coating.In addition, because cause excessive lubricant oil from the bottom end process discharge route of coating, flow to the outside of side edge part, lubricant oil can not exceedingly be supplied between coating and cylinder wall surface.This can prevent in piston ascending motion, and the shearing resistance of lubricant oil increases, thereby also reduces the friction of piston.
According to the utility model, the infall of the center line of the outer surface that the end of introduction channel is arranged on (shoulder part and base diameter part between) border and side edge part in piston peripheral direction.This is conducive to the center region that lubricant oil is incorporated into base diameter part, and when piston rises, the surface pressure in this region increases especially.Therefore, oil film can be formed on the center region of base diameter part rightly.The coating that can guarantee like this center region of base diameter part can guarantee its greasy property, and the serviceability of coating also can be improved simultaneously.
According to the utility model, owing to forming at least two discharge routes, oil film can more be formed uniformly the outer of center region of the base diameter part raising at surface pressure and place.Especially, because discharge route is not formed on the center line of side edge part, needn't reduce the peripheral coating of the center region of base diameter part.In addition also can further improve, the effect of serviceability of the peripheral coating of center region.
According to the utility model, because comprise that respectively the groove part of introduction channel and discharge route is formed on the thrust side of piston, in piston ascending motion, heavy load is applied in this thrust side, more can reduce the friction of piston in ascending motion.
According to the utility model, residual lubricant oil can be discharged to the outside of side edge part fast from discharge route, thereby can prevent that lubricant oil from being arrived base diameter part and its periphery by overfeeding.So, can prevent that shearing resistance increases due to excessive lubricant oil, therefore can be reduced in the friction of piston in ascending motion.
According to the utility model, the lubricant oil of introducing from introduction channel easily spills and enters between cylinder wall surface and base diameter part and its peripheral coating from discharge route, thereby is conducive to form oil film in base diameter part and its peripheral coating.This can improve greasy property and the serviceability of base diameter part and its peripheral coating.
According to the utility model, can collect the lubricant oil more sticking in cylinder wall surface.
According to the utility model, because oil storage portion is formed on the joint of introduction channel and discharge route as a part for groove part, lubricant oil more can be supplied to base diameter part and its periphery, thereby guarantees that oil film can be formed in base diameter part and its peripheral coating.In addition,, because oil storage portion only forms by form recess in coating, piston can have simple structure.
Accompanying drawing explanation
Fig. 1 is according to the stereogram of the first embodiment's of the present utility model piston for internal-combustion engine, for showing the structure of piston;
Fig. 2 be explain piston as shown in Figure 1 rise and decline process in the explanation schematic diagram of the thrust that produces respectively;
Fig. 3 is the stereogram of external shape of the piston of Fig. 1, for showing piston and putting on the coating on the thrust side side edge part of piston;
Fig. 4 is the planimetric map of piston while seeing from the arrow A of Fig. 3;
Fig. 5 is while seeing from the arrow B shown in Fig. 3, is arranged on the view of a part of the external shape of the side edge part in thrust side;
Fig. 6 is while seeing from the arrow B shown in Fig. 3, the view of the whole coating of thrust side side edge part;
Fig. 7 is while seeing from the arrow D shown in Fig. 3, the view of the whole coating of thrust side side edge part;
Fig. 8 forms according to the view of the coating of the thrust side side edge part of the major component of the utility model the second embodiment's piston.
Embodiment
Now, referring to figs. 1 to the first embodiment shown in Fig. 7, the utility model is described.Fig. 1 has shown and has applied a for example part for Reciprocating engine of internal-combustion engine of the present utility model.In Fig. 1, the cylindrical cylinder cover that label 1 represents as cylinder, label 2 represents to be contained in the interior reciprocating piston of cylinder liner 1.Cylinder liner 1 be positioned to firing chamber (not shown) under, this place is provided with Aspirating valves and outlet valve.Piston 2 is rotatably connected to the crankpin (not shown) of bent axle (not shown) by connecting rod 3.In firing chamber, be provided with as spark plug and injection valve; And carry out four necessary circulations according to the ON/OFF of Aspirating valves and outlet valve, the operation of spark plug and the operation of injection valve are associated with rising and the descending motion of piston 2, and the to-and-fro motion of piston 2 is converted into rotatablely moving of bent axle, thereby from bent axle output rotary driving force.Here, four essential circulations are suction stroke, compression stroke, expansion stroke and exhaust stroke.
Piston 2 is for example made by aluminum alloy, comprises the circular piston head 7 that compression ring 5 and oil ring 6 can be installed thereon.Be rotatably connected to the 8(of the pin-and-hole portion joint of connecting rod 3) be formed on the back side (back surface side) of piston crown 7, lateral margin 9 is formed on the opposite side of piston crown 7, thereby forms piston main body.Especially, in piston 2, in order to reduce friction, being arranged on piston crown 7 in cylinder liner 1 forms and has short cylindrical that total length shortens, lateral margin 9 is comprised of a pair of side edge part 10, this side edge part not wall from the opposite side of piston crown 7 along cylinder liner 1 extends in band shape mode, and crosses over the spin axis of pin-and-hole portion 8, and its bottom end is set to contrary with piston crown 7.
That is, as shown in Fig. 2 (b), in decline stroke, piston 2 is shifted to lower dead center from top dead center, is pressed towards in the same direction the internal surface (wall) of cylinder liner 1 through an end face of the piston 2 of the spin axis of pin-and-hole portion 8.As shown in Figure 2 (a) shows, in up stroke, piston 2 is shifted to top dead center from lower dead center, is pressed towards in the same direction the internal surface (wall) of cylinder liner 1 through another end face (relative side) of the piston 2 of the spin axis of pin-and-hole portion 8.The pressure (load) that piston 2 presses to the wall of cylinder liner 1 is called thrust.In addition, the side of piston 2, when piston 2 declines, its thrust-augmented side is called thrust sides T, on the contrary when piston rises, its thrust-augmented side is called the anti-side AT that pushes away.In Fig. 2, label 11 represents firing chamber, and label 12 represents Aspirating valves, and label 13 represents outlet valve, and label 14 represents bent axle.
Paired each side edge part of side edge part 10, equally as shown in Figure 5, is included in the distolateral base diameter part 11a of the bottom of side edge part 10 and at the shoulder part 11b of piston crown 7 sides.At the distolateral base diameter part 11a of the bottom and slightly different each other at the external diameter of the shoulder part 11b of piston crown 7 sides.That is, in the footpath of piston 2, make progress, being formed on the distolateral base diameter part 11a of the bottom is the external shape the best part of piston 2, and the external diameter of piston 2 is definite value.Base diameter part 11a is close to the part of the internal surface of cylinder liner 1 in piston 2.Shoulder part 11b is positioned at the more close piston head 7 than base diameter part 11a, and is the less part of external diameter than base diameter part 11a.In Fig. 5, α represents the border between base diameter part 11a and shoulder part 11b.
In paired side edge part 10, the external shape (in-plane) of the piston when arrow A from Fig. 3 similar to Figure 4 is seen, the core that is arranged on the outer surface of side edge part 10 is the maximum region of the external shape of side edge part 10.In addition, side edge part 10 comprises as lower area: when this region becomes center further from the outer surface of side edge part 10, this region is also further from the internal surface of cylinder liner 1.That is, as shown in Fig. 6 (from the arrow C of Fig. 3), by G1 line and G2 line around the centre area of base diameter part 11a center region 15(Fig. 6 is set in shown in double dot dash line), in this center region 15, external diameter is maximum in base diameter part 11a.This center region 15 is called the region that surface pressure easily increases in the to-and-fro motion of piston 2, so-called section region (grade area).While being heated, side edge part 10 expands.So near the surface pressure of the border α of shoulder part 11b (periphery of base diameter part) is also easy to increase.While seeing from arrow A in addition,, the external shape of piston 2 approaches accurate circular.
As shown in Figure 6, introduction channel 25 is formed by groove part 26, this groove part 26 in vertical direction from coating 17 the end straight line of piston crown 7 sides extend to border α between shoulder part 11b and base diameter part 11a near.When piston 2 rises, the lubricant oil on the internal surface at piston crown 7 through remaining in later cylinder liner 1 can be from the 27(of import department of end that is formed on introduction channel 25 near the end of piston crown side) flow to introduction channel 25.The lubricant oil of introducing be directed into border α near, that is, and directly over base diameter part 11a.The 28(of export department that is formed near base diameter part 11a side on introduction channel 25 (base diameter part side end) is equivalent to the first export department described in the application's claim) be positioned on the intersection point of center line β of outer surface of border α (between shoulder part 11b and base diameter part 11a) and side edge part 10.The lubricant oil of introducing be conducted through export department 28 arrive center regions 15 directly over, in this center region 15, the surface pressure of the center region of base diameter part 11a increases especially.
In addition, introduction channel 25 forms and has the conical by its shape expanding from 28Xiang import department of export department 27.When the width a2 of the width a1Bi of import department 27 export department 28 is wider, import department 27 expands commodiously with tubaeform.That is, the area of import department 27 is greater than the area of export department 28.Utilize the ascending motion of piston 2, by flaring import department 27 and taper introduction channel 25, be bonded at lubricant oil on the internal surface of cylinder liner 1 leniently region collected as much as possible and be directed to center region 15 directly over.
As shown in Figure 6, discharge route 30 is formed by groove part 26, this groove part 26 in the peripheral direction of side edge part 10 from export department's 28 displacements of introduction channel 25 and lead to the bottom end of coating 17.The displacement of the peripheral direction of utilization between introduction channel 25 and discharge route 30, the lubricant oil importing from introduction channel 25 can temporarily be trapped near the border α between shoulder part 11b and base diameter part 11a (near the tie point of introduction channel and discharge route),, directly over base diameter part 11a, here, directly over center region 15.When piston 2 rises, the lubricant oil of delay can spill between the internal surface (cylinder wall surface) of coating 17 and cylinder liner 1, thereby forms oil film in base diameter part 11a and its peripheral peripheral surface.
Especially, discharge route 30 is by a plurality of, and at least two discharge routes 30 form, and the peripheral surface that two discharge routes 30 stride across side edge part 10 is bifurcated peripheral direction at the center line β along piston peripheral direction and symmetrically.More specifically, two discharge routes 30 are comprised of symmetrical groove part 31, this groove part 31 diverges to the left and right sides from the export department 28 of introduction channel 25, parabola is drawn in two discharge routes 30 periphery round the center region 15 of base diameter part 11a after center region 15, and extends to the bottom end of coating 17.Due to discharge route 30, the lubricant oil that is not supplied to the delay between coating 17 and the internal surface of cylinder liner 1 can be directed to the outside of side edge part 10 fast.Especially, the width a2 of the export department 28 of introduction channel 25 is set to the 32(of export department the second export department than two discharge routes 30) the summation of width b2 narrower, export department 32 is comprised of the distolateral end of each bottom of side edge part 10.That is, the area of export department 28 is less than the area of export department 32.Based on this structure, the lubricant oil that flows into groove part 26 can be discharged to side edge part 10 outsides.Two discharge routes 30 form respectively has conical by its shape, and its width little by little expands towards export department 32.
At the joint of introduction channel 25 and discharge route 30, formation is as the oil storage portion 20 of a part for the groove part of for example groove part 26 and groove part 31.Oil storage portion 20 comprises recess 22, and this recess 22 is formed on the end of the coating portion putting on center region 15 and as the bottom surface of joint.More specifically, recess 22 is constructed to: put on the end towards piston crown 7 of the coating portion on center region 15, in the recessed mountain valley shape that forms of the bottom extreme direction of side edge part 10 (to center region 15).Be that oil storage portion 20 is caved in and formed by the end of the coating in side edge part 10 sides.This recess 22 is conducive to the lubricant oil of introducing from introduction channel 25 to store, be conducive to center region 15 directly over the delay of lubricant oil, and be conducive to, in base diameter part 11a and its periphery, particularly in the coating 17 of center region 15, form oil film.
In piston descending motion, large thrust (load) is applied to thrust sides side edge part 10.Yet in piston descending motion, because it is a lot of to be bonded at the amount of lubricant oil of internal surface of cylinder liner 1, even if discharge groove part 25,26, lubricant oil also can be successfully supplied to side edge part 10.In addition, in the situation that groove part 25,26 is formed on thrust sides, the shearing resistance of lubricant oil increases, thereby has increased the worry that the friction of piston in descending motion is increased.Therefore, as shown in Figure 7, introduction channel or discharge route are not formed in the coating 17 of the outer surface that puts on thrust sides side edge part 10.
Next, the operation of the piston 2 of this structure is described.Now, suppose that piston 2 rises to top dead center from lower dead center.In this case, when piston 2 rises, it is counter pushes away the internal surface that side is pressed towards cylinder liner 1.More specifically, in the anti-side that pushes away, comprise that the piston crown 7 of compression ring 5 and oil ring 6 passes through the internal surface of cylinder liner 1 and wipes lubricant oil there off, and because oil is wiped off by piston crown 7, when side edge part 10 passes through the internal surface of cylinder liner 1, the adhesive capacity of lubricant oil reduces.
Here, in the anti-coating 17 that pushes away side edge part 10, introduction channel 25 forms from coating 17 and extends near the border α between shoulder part 11b and base diameter part 11a in the end of piston crown 7.So, as shown in arrow in Fig. 1 and Fig. 6, remain in lubricant oil on the internal surface of cylinder liner 1 and be imported into passage 25 and collect and be directed near border α.In this case, the discharge route 30 communicating with the outlet of introduction channel 25 forms to the peripheral direction displacement of side edge part 10 and extends to the bottom end of coating 17.Therefore, because shoulder part 11b is different with base diameter part 11a external diameter, displacements between introduction channel 25 and discharge route 30 in peripheral direction etc., the lubricant oil that causes introducing from introduction channel 25 is trapped near introduction channel 25 and discharge route 30(near border α) tie point (joint).The lubricant oil also oil storage portion 20 directly over center region 15 collects and is detained.
Due to the ascending motion of piston 2, cause the lubricant oil being detained to spill between the internal surface (cylinder wall surface) of coating 17 and cylinder liner 1, as shown by the arrows in Figure 5, thereby form oil film in this diameter parts 11a and its peripheral peripheral surface.Here, cause excessive lubricant oil from the bottom end of coating 17, to be downward through the discharge route 30 of side edge part 10.That is, base diameter part 11a and its outer oil film of placing form: according to indirect method, lubricant oil escapes between coating 17 and the internal surface of cylinder liner 1 from base diameter part 11a top (around).
Therefore, utilize this indirect method, cause being bonded at lubricant oil on the internal surface of cylinder liner 1 and be temporarily trapped in the top (around) of base diameter part 11a, then escape between coating 17 and the internal surface of cylinder liner 1, oil film is formed on base diameter part 11a and its outer placing; And cause excessive lubricant oil to flow to outside side edge part 10.Based on this, in piston ascending motion, even the lubricants capacity on the internal surface that is bonded at cylinder liner 1 seldom time, oil film also can be formed in base diameter part 11a and its peripheral coating 17 rightly.
So in the outer coating 17 of placing of base diameter part 11a and its, this friction that is in piston in ascending motion increases, and can guarantee greasy property and therefore reduce and rub.Can also improve the serviceability of coating 17.In addition, because excessive lubricant oil is not supplied between coating 17 and the internal surface of cylinder liner 1, but rightly from bottom end discharge to side edge part 10 of coating 17, can prevent that the shearing resistance of lubricant oil in piston ascending motion from increasing, thereby reduce the piston friction in ascending motion.
Especially, in the situation that introduction channel 25 and discharge route 30 apply the counter of large load in being formed on piston ascending motion, push away in side, can reduce more energetically the piston friction in ascending motion.In this case, when supplying lubricating oil fully and while forming groove part, the piston friction in descending motion increases.Therefore, introduction channel 25 and discharge route 30 do not need to be formed in the coating 17 of side edge part 10 of thrust sides.Due to introduction channel 25 and the discharge route 30 removed on the side edge part 10 of thrust sides, can prevent that the piston friction in descending motion from increasing, and further improve the serviceability of coating 17.
The outlet end of introduction channel 25 be positioned at center region 15 central part directly over.This is conducive to the center region 15 that lubricant oil is incorporated into base diameter part 11a, and the surface pressure in this region increases especially.In addition, even the 15(section region, center region of base diameter part 11a) surface pressure increase maximumly, oil film also can form rightly.So, also more can guarantee center region 15 coating 17 greasy property and improve its serviceability.
Because it is wider than export department 28 that the import department 27 of introduction channel 25 forms, more can collect the lubricant oil on the internal surface that is bonded at cylinder liner 1, thereby can effectively lubricant oil be incorporated into base diameter part 11a and its periphery.In addition, because discharge route 30 comprises two discharge routes, these two discharge routes are crossed over center line β the displacement symmetrically in peripheral direction of side edge part 10, lubricant oil is easily from being around fed to more base diameter part 11a, thereby oil film can more be formed uniformly on the center region 15 of the special base diameter part 11a increasing of surface pressure.In addition, because discharge route 30 is not formed on the center line of side edge part 10, do not need to reduce the coating 17 of the center region 15 of base diameter part 11a, thereby can advantageously improve the serviceability of the coating of center region 15.
Because the width a2 of the export department 28 of introduction channel 25 is set to narrower than the summation of the width b2 of each export department 32 of each discharge route 30, excessive lubricant oil can be soon from discharge route 30 discharge to side edge part 10.This can prevent that lubricant oil from being arrived the center region 15 of base diameter part 11a by overfeeding, prevent because lubricant oil increases shearing resistance, and prevent the piston friction in piston ascending motion.
Because oil storage portion 20 be formed on base diameter part 11a center region 15 directly over, thereby can guarantee center region 15 directly over have enough lubricant oil, lubricant oil more can be supplied to center region 15, thereby oil film more can be formed in the coating 17 of center region 15.In addition,, because oil storage portion 20 is only set to by form recess 22 in coating 17, the structure of this piston is very simple.
Fig. 8 has shown the second embodiment of the present utility model.The present embodiment is from the different of first embodiment: the width a2 28(of export department first export department of introduction channel 25) is set to larger than the summation of width b2 of each export department 32 of discharge route 30.According to this, arrange, the lubricant oil of introducing from introduction channel 25 easily escapes between cylinder wall surface and the coating 17 of base diameter part 11a from discharge route 30, thereby is conducive to form oil film in the coating 17 of base diameter part 11a.So, further improve greasy property and the serviceability of the coating 17 of base diameter part 11a.
In Fig. 8, the part label identical with the first embodiment is identical, and it describes omission.Here, the utility model is not limited to above-described embodiment, under the prerequisite that does not deviate from main idea of the present utility model, can adopt various changes.For example, in above-described embodiment, introduction channel and discharge route are formed in the coating of the anti-side edge part that pushes away side.Yet introduction channel and discharge route also may be formed in thrust sides or the anti-coating pushing away with thrust sides both sides' side edge part.In addition, in an embodiment, piston adopts single oil storage portion, single introduction channel and two discharge routes.Yet this does not limit, can adopt a plurality of oil storage portion, a plurality of introduction channel and three above discharge routes.In above-described embodiment, base diameter partly has given width.Yet the external shape of piston is not limited to this.For example, thereby the utility model also can be applied to have the external shape and the piston with maximum outer radius portion of arc, has and accounts for the very piston of the base diameter part of fraction.
[label list]
1: cylinder liner (cylinder)
7: piston crown
8: pin-and-hole portion (joint)
10: side edge part
11a: base diameter part
11b: shoulder part
15: center region
17: coating
20: oil storage portion
25: introduction channel
26: groove part
30: discharge route
31: groove part
Claims (8)
1. for a piston for internal-combustion engine, it is characterized in that, comprising:
Piston crown, described piston crown is arranged in the cylinder of described internal-combustion engine;
Joint, described joint is for being rotatably connected to described piston crown by the end of connecting rod;
A pair of side edge part, described a pair of side edge part with respect to the spin axis of described joint respectively the wall from the opposition side of described piston crown along described cylinder extend, the bottom end of described side edge part is arranged on the described opposition side of described piston crown; With
Coating, described coating puts on respectively on the outer surface of described side edge part; Wherein
Each side edge part in described a pair of side edge part comprises base diameter part and shoulder part, footpath at described piston makes progress, the external diameter of described base diameter part is maximum in described side edge part, described shoulder is partly arranged on than a side of the more close described piston crown of described base diameter part, and the external diameter of described shoulder part is less than the external diameter of described base diameter part; And
Put on the described coating on side edge part described at least one and comprise groove part, described groove part has introduction channel and discharge route, described introduction channel extends to the boundary vicinity between described shoulder part and described base diameter part from described coating in the end of described piston crown side, and described discharge route extends to described coating in the described bottom distolateral end to displacement in the end of described base diameter part side the peripheral direction at described piston from described introduction channel.
2. the piston for internal-combustion engine as claimed in claim 1, is characterized in that,
Described introduction channel in the described end of described base diameter part side at the described outer surface of the described border between described shoulder part and described base diameter part and described side edge part the infall of the center line in the peripheral direction at described piston.
3. the piston for internal-combustion engine as claimed in claim 1, is characterized in that,
Described discharge route comprises at least two discharge routes, and with respect to the described outer surface of described side edge part, the center line in the described peripheral direction of described piston forms described at least two discharge routes symmetrically.
4. the piston for internal-combustion engine as claimed in claim 1, is characterized in that,
Described groove part is formed on a side edge part in described side edge part, and when described piston rises in described cylinder, the surface pressure of a described side edge part on described cylinder increases.
5. the piston for internal-combustion engine as described in any one in claim 1 to 4, is characterized in that,
The first export department is arranged on described introduction channel near the end of described base diameter part side, the second export department is arranged on described discharge route near the distolateral end of the bottom of described side edge part, and the width of described the first export department in described peripheral direction is less than the summation of the width of described the second export department.
6. the piston for internal-combustion engine as described in any one in claim 1 to 4, is characterized in that,
The first export department is arranged on described introduction channel near the end of described base diameter part side, the second export department is arranged on described discharge route near the distolateral end of the bottom of described side edge part, and the width of described the first export department in described peripheral direction is greater than the summation of the width of described the second export department.
7. the piston for internal-combustion engine as described in any one in claim 1 to 4, is characterized in that,
Import department is arranged on described introduction channel near an end of described piston crown side, the first export department be arranged on described introduction channel the other end near, the width of described import department in described peripheral direction is greater than the width of described the first export department.
8. the piston for internal-combustion engine as described in any one in claim 1 to 4, is characterized in that,
Oil storage portion is arranged on the joint place of described introduction channel and described discharge route, and described oil storage portion forms a part for described groove part; And
Described oil storage portion is recess in the distolateral end of the described bottom of described side edge part, and described recess is by by described coating, the described bottom concave end towards described side edge part forms.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012139751A JP6137441B2 (en) | 2012-06-21 | 2012-06-21 | Piston of internal combustion engine |
| JP2012-139751 | 2012-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203515847U true CN203515847U (en) | 2014-04-02 |
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ID=50103690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320356213.9U Expired - Lifetime CN203515847U (en) | 2012-06-21 | 2013-06-20 | Piston of internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6137441B2 (en) |
| CN (1) | CN203515847U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026426A (en) * | 2018-08-15 | 2018-12-18 | 全椒县全动机械有限公司 | A kind of internal combustion engine and its surface treatment method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2554430Y2 (en) * | 1990-07-12 | 1997-11-17 | トヨタ自動車株式会社 | Piston for internal combustion engine |
| JP3108903B2 (en) * | 1995-04-18 | 2000-11-13 | 株式会社クボタ | Piston engine |
| JP2000297694A (en) * | 1999-04-09 | 2000-10-24 | Isuzu Motors Ltd | Piston for internal combustion engine |
| JP2001182612A (en) * | 1999-12-22 | 2001-07-06 | Toyota Motor Corp | Piston for internal combustion engine |
| JP4018419B2 (en) * | 2002-03-29 | 2007-12-05 | 本田技研工業株式会社 | Piston of internal combustion engine |
| US8640669B2 (en) * | 2007-08-24 | 2014-02-04 | Honda Motor Co., Ltd. | Piston for an internal combustion engine |
-
2012
- 2012-06-21 JP JP2012139751A patent/JP6137441B2/en active Active
-
2013
- 2013-06-20 CN CN201320356213.9U patent/CN203515847U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026426A (en) * | 2018-08-15 | 2018-12-18 | 全椒县全动机械有限公司 | A kind of internal combustion engine and its surface treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014005736A (en) | 2014-01-16 |
| JP6137441B2 (en) | 2017-05-31 |
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Address after: No. 21, No. 3, Dingmu, No. 1, Toshiba, Tokyo, Japan Patentee after: Mitsubishi Jidosha Kogyo Kabushiki Kaisha Address before: Tokyo, Japan, Hong Kong port 5 Zhi Ding,, No. 33 Patentee before: Mitsubishi Jidosha Kogyo Kabushiki Kaisha |
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Granted publication date: 20140402 |