WO2014196282A1 - 内燃機関用ピストンおよびそのピン穴の加工方法 - Google Patents
内燃機関用ピストンおよびそのピン穴の加工方法 Download PDFInfo
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- WO2014196282A1 WO2014196282A1 PCT/JP2014/061478 JP2014061478W WO2014196282A1 WO 2014196282 A1 WO2014196282 A1 WO 2014196282A1 JP 2014061478 W JP2014061478 W JP 2014061478W WO 2014196282 A1 WO2014196282 A1 WO 2014196282A1
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- WIPO (PCT)
- Prior art keywords
- piston
- pin hole
- pin
- internal combustion
- combustion engine
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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
- F02F3/0084—Pistons the pistons being constructed from specific materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
- F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
Definitions
- the present invention relates to a piston for an internal combustion engine and a method for machining the pin hole thereof, and more particularly to a piston connected to a connecting rod via a piston pin, and including a pin boss formed with a pin hole through which the piston pin is inserted. And a method of processing the pin hole.
- the internal combustion engine receives the pressure of gas expansion accompanying combustion in the cylinder by the piston and transmits it to the crankshaft of the crankshaft via the connecting rod connected by the piston pin, thereby rotating the piston linearly by rotating the crankshaft. It is converted to motion and output. At this time, a large mechanical load is applied to the inner surface of the pin hole of the pin boss of the piston and closer to the piston center on the combustion chamber side. In particular, due to the demand for higher output and smaller size of the internal combustion engine, a large load is applied to the pin hole portion, which increases the risk of pin hole cracking.
- an aluminum silicon alloy is cast to produce the piston.
- aluminum silicon alloy has the property that primary silicon tends to become a large-growth cast structure, and if plastic processing or cutting is performed in this state, cracks will occur at the interface between primary silicon and aluminum matrix. The mechanical properties may be reduced.
- a crack is likely to occur in the pin hole portion.
- the subject of the present invention is to prevent the cracks and galling caused by the increase in the surface pressure between the piston pin and the pin hole due to the increase in the load due to the high output of the internal combustion engine and the reduction in the piston pin diameter accompanying the downsizing.
- An object of the present invention is to provide a piston for an internal combustion engine.
- Another object of the present invention is to provide a piston for an internal combustion engine in which oil film breakage between a piston pin and a pin hole is suppressed, and lubrication is performed more completely to ensure sufficient oil. is there.
- Still another object of the present invention is to provide a piston for an internal combustion engine in which the concentration of stress at the end of the pin hole at the center of the piston or the outer periphery of the piston is prevented, or the occurrence of cracks associated with the concentration of stress is prevented. It is to be.
- Still another object of the present invention is to provide a piston for an internal combustion engine that can suppress the occurrence of galling between a piston pin and a pin hole and is easy to manufacture and inexpensive.
- a main invention of the present application is a piston connected to a connecting rod via a piston pin, the piston including a pin boss formed with a pin hole through which the piston pin is inserted, Cast from aluminum silicon alloy, and at least the piston center side portion of the pin hole is a tapered hole having a larger diameter on the piston center side, and the dimple processing is performed on the inner surface of the pin hole.
- the internal combustion engine piston has a concave portion formed as a reservoir for lubricating oil, and the primary crystal silicon in the piston base material is refined by the dimple processing to form a fine layer on the inner surface of the pin hole.
- a portion of the pin hole on the piston center side is a tapered hole having a larger diameter on the center side
- a portion of the pin hole on the outer periphery side of the piston is a tapered hole having a larger diameter on the outer periphery side
- the intermediate portion of the pin hole may be a straight pin hole.
- the tapered hole may have an inclination of 20 minutes or less.
- the tapered hole may be formed by combining a plurality of taper angles stepwise. Further, the dimple processing may be performed by spraying spherical particles onto the inner surface of the pin hole.
- the primary silicon in the piston base material near the inner surface of the pin hole may be refined to form a fine layer. Further, the dimple processing may not be performed in the vicinity of the locking ring groove of the pin hole.
- another main invention is a piston that is connected to a connecting rod via a piston pin, and includes a pin boss formed with a pin hole through which the piston pin is inserted.
- a relief part that escapes the piston pin is formed at least on the top surface side of the piston in the pin hole and on the center side that receives high pressure due to deformation of the piston pin, and is cast by an aluminum silicon alloy.
- Dimple processing is applied to the inner surface, and the concave portion formed by the dimple processing is used as an oil reservoir, and the primary silicon in the piston base material is refined by the dimple processing to form a fine layer on the inner surface of the pin hole.
- the present invention relates to a piston for an internal combustion engine.
- the dimple processing may be performed by spraying spherical particles onto the inner surface of the pin hole. Further, the dimple processing may not be performed in the vicinity of the locking ring groove of the pin hole.
- the main invention related to the processing method is a piston connected to a connecting rod via a piston pin, the piston including a pin boss formed with a pin hole through which the piston pin is inserted.
- Cast from aluminum silicon alloy and taper at least the piston center side of the pin hole so that the piston center side has a larger diameter taper hole and dimple on the inner surface of the pin hole The concave portion formed by the dimple processing is made into a lubricating oil reservoir, and the primary silicon in the piston base material is refined by the dimple processing to form a fine layer on the inner surface of the pin hole.
- the present invention relates to a method for machining a pin hole of a piston for an internal combustion engine.
- the dimple processing may not be performed by a mask applied directly. Further, a shield having a side opening smaller than the pin hole is placed on the piston, spherical particles are injected obliquely through the small opening, and in the vicinity of the locking ring groove of the pin hole by the small opening, Dimple processing may be prevented from being performed.
- Another main invention related to the processing method is a piston connected to a connecting rod via a piston pin, the piston including a pin boss formed with a pin hole through which the piston pin is inserted. Cast from aluminum silicon alloy, and form a relief part that escapes the piston pin at the center of the piston at least on the top surface side of the piston, and dimples on the inner surface of the pin hole.
- the present invention relates to a method for processing a pin hole of a piston for an internal combustion engine in which the primary crystal silicon in the piston base material is refined by dimple processing to form a fine layer on the inner surface of the pin hole.
- the dimple processing may not be performed by a mask applied directly. Further, a shield having a side opening smaller than the pin hole is placed on the piston, spherical particles are injected obliquely through the small opening, and in the vicinity of the locking ring groove of the pin hole by the small opening, Dimple processing may be prevented from being performed.
- the main invention of the present application is a piston for an internal combustion engine cast by an aluminum silicon alloy. At least a portion of the pin hole on the center side of the piston is a tapered hole having a larger diameter on the piston center side, or a relief portion.
- dimple processing is performed on the inner surface of the pin hole, and the concave portion formed by the dimple processing is used as an oil reservoir for the lubricating oil, and the primary crystal silicon in the piston base material is refined by the dimple processing to thereby increase the inner surface of the pin hole. Is strengthened by a fine layer.
- the pin hole is formed of a tapered hole, local stress concentration on the inner surface of the pin hole due to deformation of the piston pin due to combustion pressure is eliminated.
- the pressure resistance of the surface is improved.
- the lubricating oil is reliably held by the oil sump formed by the dimples, the lubrication failure between the piston pin and the pin hole can be avoided and galling can be suppressed.
- the inner surface of the pin hole is strengthened by a fine layer formed by miniaturizing primary crystal silicon formed by dimple processing.
- This piston is, for example, a piston cast from an aluminum silicon alloy containing 10 to 20% silicon, and is used for a direct injection type diesel engine.
- the upper surface of the piston is a flat surface, and a combustion chamber 10 is formed by a concave portion at a substantially central portion of the flat surface.
- On the outer peripheral surface of this piston three ring grooves 11, 12, 13 are formed in order from the top. Piston rings or oil rings are installed in these ring grooves.
- the piston is cooled inside the ring grooves 11, 12, and 13 and obliquely below the combustion chamber 10 so as to penetrate the piston in the circumferential direction.
- a working cavity 14 is formed. Oil is injected into the cooling cavity 14 from below and circulates to suppress a temperature rise during operation.
- a pair of pin bosses 18 are formed in the lower part of the piston so as to be orthogonal to the axis of the piston.
- a pin hole 20 is formed in the pin boss 18 so as to penetrate the center portion thereof.
- a piston pin 21 indicated by a chain line in FIG. 3 is inserted into the pin hole 20.
- the piston pin 21 connects the piston and the connecting rod 22.
- a locking ring groove 24 is formed so that the piston pin 21 inserted into the pin hole 20 does not fall off, and the movement of the piston pin 21 in the axial direction is suppressed by the locking ring attached to the locking ring groove 24. I am doing so.
- an intermediate portion in the axial direction is constituted by a straight portion 26, and a portion on the piston center side is a tapered portion 27.
- a portion on the outer peripheral side of the piston is constituted by a tapered portion 28.
- the taper portion 27 on the piston center side is a taper portion in which three tapers having different angles are combined stepwise.
- the taper portion 28 on the outer peripheral side of the piston has a structure in which three tapers are combined stepwise.
- the taper angle is an angle within 20 minutes, and is set to such a value that it is gradually changed in steps of 2 to 4 tilt angles so that the tilt angle is continuous with the straight portion 26 of 0 degree. Is preferred.
- a concave portion 33 by dimple processing as shown in FIG. 6 and a fine layer by miniaturization of primary crystal silicon by dimple processing are formed on the inner surface of the pin hole 20.
- the recess 33 is formed by a micropeening process described later.
- the fine layer 34 is formed along the inner surface of the pin hole 20 by physically miniaturizing primary silicon that forms an alloy with aluminum by jetting spherical particles.
- the end of the pin hole 20 on the outer peripheral side is not subjected to dimple processing. That is, at the time of dimple processing, a mask 32 made of polyurethane, hard rubber, POM resin, or the like is previously placed on the inner surface of the pin hole 20 and on the outer peripheral side.
- Innumerable recesses 33 are formed on the inner surface of the pin hole 20 other than the covered portion by dimple processing.
- the recess 33 shown in FIG. 6 serves as an oil reservoir for retaining lubricating oil, thereby achieving better lubrication between the piston pin 21 and the pin hole 20.
- the spherical particles are prevented from being ejected into the locking ring groove 24 by the mask 32, the edge of the locking ring groove 24 does not fall.
- micropeening process is performed under the following conditions.
- Spherical particle injection angle 20 to 60 degrees (angle relative to the surface of the pin hole 20)
- Injection pressure 0.20 to 1.0 MPa
- Projection material Spherical particles (particle size distribution center diameter 20-200 ⁇ m)
- Projection time 5 to 40 seconds
- Roughness of pin hole 20 surface Ra 0.5 to 5.0 ⁇ m
- the surface roughness of the inner surface of the pin hole 20 when the injection pressure is increased or decreased using spherical particles of the same size changes as shown in Table 1. Note that the measurement points on the upper surface, lower surface, and two side surfaces in Table 1 correspond to FIG.
- Table 1 the measurement points on the upper surface, lower surface, and two side surfaces in Table 1 correspond to FIG.
- the pin hole fitting accuracy can be ensured, and the selection of the projection material and the adjustment of the injection pressure, which have a uniform surface roughness over the entire inner surface of the pin hole, must be performed appropriately.
- the above-mentioned injection pressure is a value of 0.20 to 1.0 MPa. If it is larger than this value, the roughness range (Ra) becomes large and the fitting accuracy with the piston pin varies. On the other hand, when it is smaller than the above range, there is a problem that the processing effect does not appear.
- FIG. 6 is an image when the micro peening process is performed on the inner surface of the pin hole 20 of the piston, whereby an oil sump consisting of a large number of recesses 33 is formed on the inner surface of the pin hole, and lubricity is improved.
- the primary crystal silicon in the base material of the piston is miniaturized and the fine layer 34 is formed.
- the fine layer 34 is physically formed and has a thickness of about 10 to 50 ⁇ m.
- FIG. 7 shows an SEM image of the inner surface of the pin hole subjected to such processing.
- FIG. 8 shows a microstructure of a cross section of the pin hole subjected to such processing.
- FIG. 9 shows an increase in strength due to a combination of the micropeening process as described above and the profile shape of the inner surface of the pin hole 20.
- the strength increases to 105% according to the side relief-shaped pin hole of the second embodiment described later.
- the strength is 110%.
- the micropeening process is applied to a straight shape, the strength is 120%.
- the strength becomes 130% and the strength is improved by 30%.
- FIG. 10 shows the result of an endurance test by experiment.
- a piston subjected to micropeening processing is incorporated into the first cylinder and the third cylinder of a four-cylinder engine, and an untreated piston is incorporated into the second cylinder and the fourth cylinder.
- FIG. 11 shows the attachment of the piston to the processing device by the micropeening process for forming the oil sump as described above.
- This apparatus includes an index table 36.
- the index table 36 is provided with piston holding portions at six locations at intervals of 60 degrees in the circumferential direction.
- Each holding portion is provided with a mounting base 37, and a piston is held by a protruding holding portion 38 of the mounting base 37.
- the shape of the upper end side of the protruding holding portion 38 is substantially the same as the shape of the connecting rod 22, and the protruding holding portion 38 is inserted between the pin bosses 18 on both sides so that the piston is held on the mounting base 37.
- the shield 41 which makes a reverse cup shape from the top is covered.
- Circular openings 42 are formed on both sides of the shield 41. Depending on the relative positional relationship between the size of the opening 42 and the injection angle by the injection nozzle 46, it is possible to set a dimple processing region with respect to the inner surface of the pin hole 20.
- FIG. 12 shows a series of steps of the micropeening process for dimple processing.
- the shield 41 descends from above, and the shield 41 is placed on the piston mounted on the mounting base 37.
- the injection nozzle 46 attached to the tip of the injection arm 45 injects spherical fine particles from an angle of 30 degrees, thereby performing injection processing on the inner surface of the pin hole 20 of the piston.
- the opening 42 of the shield 41 suppresses the processing of the piston outer peripheral side portion of the pin hole 20 and prevents the injection of fine particles into the portion of the locking ring groove 24. Accordingly, it becomes possible to set the processing area of the dimple processing by the shield 41 without covering the mask 32.
- step 3 the gun that injects only air descends, and thereby the fine particles accumulated on the inner surface of the pin hole 20 of the piston are blown off and removed. Thereafter, in step 4, the shield 41 is raised. In step 5, the index table 36 rotates 60 degrees, and the next piston is processed.
- the piston of the present embodiment includes the tapered portions 27 and 28 on the piston center side and the piston outer peripheral side of the pin hole 20, respectively, and the vicinity of the outer peripheral side where the locking ring groove 24 is formed.
- a recess 33 is formed on the inner surface of the pin hole 20 by dimple processing to form an oil reservoir, and a fine layer 34 is formed by refining primary crystal silicon. Therefore, damage to the pin hole 20 due to local stress concentration is avoided, and good lubrication between the piston pin 21 and the pin hole 20 is ensured.
- the concentration of stress associated with the deformation of the piston pin 21 described above is alleviated by the taper portion 27 on the piston center side of the pin hole 20 and the taper portion 28 on the piston outer peripheral side, Breakage of the pin boss 18 in which the pin hole 20 is formed is prevented.
- such an effect of preventing destruction brings a great merit when the internal combustion engine has a high output and is downsized.
- the formation of the concave portion 33 by dimple processing for the pin hole 20 generates a compressive residual stress on the inner surface of the pin hole 20 and improves the surface hardness. This provides the advantage of increasing the strength of the pin hole 20 itself.
- dimple processing refines the primary crystal silicon in the piston base material near the inner surface of the pin hole 20 to form a fine layer near the inner surface of the pin hole 20.
- the primary crystal silicon exposed on the processed surface in the aluminum alloy constituting the piston is refined, thereby contributing to the improvement of the strength of the pin hole 22. Therefore, such refinement of primary silicon results in an increase in the strength of the inner surface of the pin hole 20.
- this crack prevention measure has an advantage that it can be realized at a lower cost than the pin hole reinforcing bush.
- the relief portion 52 is provided in the piston center side portion of the pin hole 20. Is formed. That is, as shown in FIG. 3, the deformation of the piston pin 21 is a curved " ⁇ " shaped so that the center portion protrudes toward the top surface side and both end sides are displaced downward during normal operation. The shape is deformed. At the same time, when the piston pin 21 is hollow, the piston pin 21 is deformed so as to be flattened, and a large pressure is locally applied to the pin hole 20.
- the relief portion 52 is formed in the portion of the pin hole 20 that comes into contact with the deformation of the piston pin 21 described above, the piston pin 21 that is deformed so that a partial portion of the pin hole 20 is crushed.
- the relief portion 52 is formed in the portion where the local stress is applied by the piston pin 21 as described above, and the relief portion 52 is intended to relieve the stress.
- a dimple-processed surface as shown in FIG. 6 is formed on the inner surface portion of the pin hole 20 except for the vicinity of the locking ring groove 24.
- the inner surface of the pin hole 20 is reinforced and reinforced by a reinforcing layer made of the fine layer 34 of primary crystal silicon. That is, in this embodiment, a relief portion 52 is formed in place of the taper portions 27 and 28.
- Other configurations are the same as those in the first embodiment.
- the configuration in which the dimple processing is not performed on the inner surface of the pin hole 20 in the vicinity of the locking ring groove 24 is the same as in the first embodiment, and the mask 32 is directly applied (FIG. 4). Or by the opening 42 (FIG. 11) of the shield 41.
- the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.
- the shape of the pin hole 20 in the above embodiment, the size of the concave portion 33 formed by dimple processing formed on the inner surface thereof, or the number thereof can be variously changed depending on the output of the internal combustion engine used. Is possible.
- the present invention can be used as a piston incorporated in a cylinder of an internal combustion engine, particularly a direct injection diesel engine.
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Abstract
Description
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストン中心側の部分をピストン中心側の方が大径のテーパ穴とし、しかも前記ピン穴の内表面にディンプル加工を施して該ディンプル加工による凹部を潤滑油の油溜まりとするとともに、前記ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピン穴の内表面に微細層を形成した内燃機関用ピストンに関するものである。
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストン頂面側であってピストンピンの変形によって高い圧力を受ける中心側に前記ピストンピンを逃げるリリーフ部を形成し、しかも前記ピン穴の内表面にディンプル加工を施して該ディンプル加工による凹部を潤滑油の油溜まりとするとともに、前記ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピン穴の内表面に微細層を形成した内燃機関用ピストンに関するものである。
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストン中心側の部分をピストン中心側の方が大径のテーパ穴になるようにテーパ加工を施すとともに、前記ピン穴の内表面にディンプル加工を施して該ディンプル加工による凹部を潤滑油の油溜まりとするとともに、前記ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピン穴の内表面に微細層を形成するようにした内燃機関用ピストンのピン穴の加工方法に関するものである。
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストンの頂面側の部分であってピストン中心側に前記ピストンピンを逃げるリリーフ部を形成するとともに、前記ピン穴の内表面にディンプル加工を施して該ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピン穴の内表面に微細層を形成するようにした内燃機関用ピストンのピン穴の加工方法に関するものである。
11~13 リング溝
14 冷却用空洞
18 ピンボス
20 ピン穴
21 ピストンピン
22 コネクティングロッド
24 係止リング溝
26 ストレート部
27 中心側テーパ部
28 外周側テーパ部
32 マスク
33 凹部(ディンプル加工面)
34 微細層
36 インデックステーブル
37 取付け台
38 突出保持部
41 遮蔽体
42 開口
45 噴射アーム
46 噴射ノズル
47 空気噴射用ノズル
52 リリーフ部
噴射圧力:0.20~1.0MPa
投射物質:球形粒子(粒度分布の中心径20~200μm)
投射時間:5~40秒
ピン穴20表面の粗さ:Ra0.5~5.0μm
Claims (16)
- コネクティングロッドにピストンピンを介して連結するピストンであって、前記ピストンピンを挿通するピン穴を形成したピンボスを備えるピストンにおいて、
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストン中心側の部分をピストン中心側の方が大径のテーパ穴とし、しかも前記ピン穴の内表面にディンプル加工を施して該ディンプル加工による凹部を潤滑油の油溜りとするとともに、前記ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピン穴の内表面に微細層を形成した内燃機関用ピストン。 - 前記ピン穴の内のこのピストン中心側の部分を中心側の方が大径のテーパ穴とするとともに、前記ピン穴のピストン外周側の部分を外周側の方が大径のテーパ穴とし、しかも前記ピン穴の中間部をストレートなピン穴とした請求項1に記載の内燃機関用ピストン。
- 前記テーパ穴が20分以下の傾斜を有する請求項1または2に記載の内燃機関用ピストン。
- 前記テーパ穴が複数のテーパ角度を有するテーパ穴を段階的に組合わせて成る請求項1または2に記載の内燃機関用ピストン。
- 前記ディンプル加工が球形粒子を前記ピン穴の内表面に噴射して施される請求項1に記載の内燃機関用ピストン。
- 前記ディンプル加工のための球形粒子の噴射によってピストン母材中の初晶シリコンであってピン穴内表面および近傍の初晶シリコンが微細化されて微細層が形成される請求項5に記載の内燃機関用ピストン。
- 前記ピン穴の係止リング溝の近傍では、マスキングを施し球形粒子を直接当てない請求項3または4に記載の内燃機関用ピストン。
- コネクティングロッドにピストンピンを介して連結するピストンであって、前記ピストンピンを挿通するピン穴を形成したピンボスを備えるピストンにおいて、
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストン頂面側であってピストンピンの変形によって高い圧力を受ける中心側に前記ピストンピンを逃げるリリーフ部を形成し、しかも前記ピン穴の内表面にディンプル加工を施して該ディンプル加工による凹部を潤滑油の油溜まりとするとともに、前記ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピストン穴の内表面に微細層を形成した内燃機関用ピストン。 - 前記ディンプル加工が球形粒子を前記ピン穴の内表面に噴射して施される請求項8に記載の内燃機関用ピストン。
- 前記ピン穴の係止リング溝の近傍では、前記ディンプル加工がなされない請求項8に記載の内燃機関用ピストン。
- コネクティングロッドにピストンピンを介して連結するピストンであって、前記ピストンピンを挿通するピン穴を形成したピンボスを備えるピストンにおいて、
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストン中心側の部分をピストン中心側の方が大径のテーパ穴になるようにテーパ加工を施すとともに、前記ピン穴の内表面にディンプル加工を施して該ディンプル加工による凹部を潤滑油の油溜まりとするとともに、前記ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピン穴の内表面に微細層を形成するようにした内燃機関用ピストンのピン穴の加工方法。 - 前記ピン穴の係止リング溝の近傍では、直接施されたマスクによって前記ディンプル加工が行なわれないようにした請求項11に記載の内燃機関用ピストンのピン穴の加工方法。
- 前記ピン穴よりも小さな開口を側部に有する遮蔽体を前記ピストンに被せ、前記小さな開口を通して斜めに球形粒子を噴射し、前記小さな開口によって前記ピン穴の係止リング溝の近傍では、前記ディンプル加工が行なわれないようにした請求項11に記載の内燃機関用ピストンのピン穴の加工方法。
- コネクティングロッドにピストンピンを介して連結するピストンであって、前記ピストンピンを挿通するピン穴を形成したピンボスを備えるピストンにおいて、
アルミニウムシリコン合金によって鋳造し、前記ピン穴の内の少なくともこのピストンの頂面側であってピストン中心側に前記ピストンピンを逃げるリリーフ部を形成するとともに、前記ピン穴の内表面にディンプル加工を施して該ディンプル加工によってピストン母材中の初晶シリコンを微細化して前記ピン穴の内表面に微細層を形成するようにした内燃機関用ピストンのピン穴の加工方法。 - 前記ピン穴の係止リング溝の近傍では、直接施されたマスクによって前記ディンプル加工が行なわれないようにした請求項14に記載の内燃機関用ピストンのピン穴の加工方法。
- 前記ピン穴よりも小さな開口を側部に有する遮蔽体を前記ピストンに被せ、前記小さな開口を通して斜めに球形粒子を噴射し、前記小さな開口によって前記ピン穴の係止リング溝の近傍では、前記ディンプル加工が行なわれないようにした請求項14に記載の内燃機関用ピストンのピン穴の加工方法。
Priority Applications (5)
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BR112015029967A BR112015029967A2 (pt) | 2013-06-03 | 2014-04-23 | pistão para motor de combustão interna e método para trabalhar furo de pino |
CN201480031573.9A CN105378255B (zh) | 2013-06-03 | 2014-04-23 | 内燃机用活塞及其销孔的加工方法 |
EP14807471.9A EP3006711A4 (en) | 2013-06-03 | 2014-04-23 | Internal-combustion-engine piston and pin-hole-forming method therefor |
US14/895,340 US20160115898A1 (en) | 2013-06-03 | 2014-04-23 | Piston for internal combustion engine and method for working pin bore |
US15/818,122 US20180100464A1 (en) | 2013-06-03 | 2017-11-20 | Method for forming a pin bore |
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JP2013117273A JP6254368B2 (ja) | 2013-06-03 | 2013-06-03 | 内燃機関用ピストンおよびそのピン穴の加工方法 |
JP2013-117273 | 2013-06-03 |
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US14/895,340 A-371-Of-International US20160115898A1 (en) | 2013-06-03 | 2014-04-23 | Piston for internal combustion engine and method for working pin bore |
US15/818,122 Division US20180100464A1 (en) | 2013-06-03 | 2017-11-20 | Method for forming a pin bore |
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CN111070081A (zh) * | 2019-12-26 | 2020-04-28 | 江苏微影智能装备有限公司 | 一种研磨机用pin针自动上下料和进孔机构 |
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FR3082446B1 (fr) * | 2018-06-14 | 2021-04-16 | Psa Automobiles Sa | Procede de texturation d’une surface sollicitee en frottement lubrifie et surface ainsi obtenue |
JP2020180573A (ja) * | 2019-04-25 | 2020-11-05 | 株式会社クボタ | ピストンとコンロッドの支承構造 |
CN111456865A (zh) * | 2020-04-09 | 2020-07-28 | 南京尚德柴油机有限公司 | 内燃机活塞及内燃机 |
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2013
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EP3006711A1 (en) | 2016-04-13 |
CN105378255A (zh) | 2016-03-02 |
US20180100464A1 (en) | 2018-04-12 |
CN105378255B (zh) | 2019-04-26 |
JP2014234778A (ja) | 2014-12-15 |
JP6254368B2 (ja) | 2017-12-27 |
US20160115898A1 (en) | 2016-04-28 |
EP3006711A4 (en) | 2017-01-18 |
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