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公开(公告)号：US20210102511A1
公开(公告)日：2021-04-08
申请号：US16606992
申请日：2018-04-12
摘要： It is an object of the present invention to provide a novel internal-combustion engine piston which makes it possible to achieve both an improvement in thermal efficiency and a reduction in exhaust harmful components, and to suppress the occurrence of abnormal combustion such as knocking and pre-ignition. A cooling passage is formed in a piston, and on a top face of the piston are provided a first heat shielding layer composed of a material having a lower thermal conductivity and volumetric specific heat than those of a piston base material, and a second heat shielding layer composed of a material having a lower thermal conductivity and volumetric specific heat than those of the first heat shielding layer, wherein a first distance between the first heat shielding layer and the cooling passage is set to be less than a second distance between the second heat shielding layer and the cooling passage. A cooling loss can be reduced by the second heat shielding layer, and the vaporization of fuel adhering to the piston can be promoted by the first heat shielding layer to reduce exhaust gas harmful components. Since the first distance is less than the second distance, the temperature of the first heat shielding layer does not rise excessively, whereby the occurrence of knocking and pre-ignition can be suppressed.
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2.发明申请公开(公告)号：US20180369954A1
公开(公告)日：2018-12-27
申请号：US15779810
申请日：2016-11-29
摘要： A piston for an internal combustion engine has a surface treatment portion on a piston base material at a piston crown surface, the surface treatment portion including, along the direction of depth from the surface side, a first layer that is comprised of a layer of a first metal or a layer containing the first metal, a second layer that contains both a second metal containing oxygen or an oxide of the second metal and a low-thermal-conductivity material, and a third layer that is comprised of a mixture of a third metal and the low-thermal-conductivity material.
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公开(公告)号：US20190390591A1
公开(公告)日：2019-12-26
申请号：US16484043
申请日：2018-02-02
摘要： Provided is a piston for an internal combustion engine, the piston enabling both an improvement in heat efficiency and a reduction in emissions, and enabling the prevention of overheating of the piston to prevent the occurrence of knocking, pre-ignition, and a drop in air filling efficiency. This piston (100a) for an internal combustion engine constitutes a portion of a combustion chamber (9) of an internal combustion engine (200) and includes a substrate (103), a first film (101) provided on a section of the top surface of the substrate (103) contacting the combustion chamber (9), and a second film (102) provided on another section of the top surface. The piston for the internal combustion engine is characterized in that: the first film (101) has a lower heat conductivity and heat capacity than the substrate (103), and the second film (102) has a lower heat conductivity than the substrate (103) and a higher heat capacity than the first film (101).
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4.发明申请公开(公告)号：US20160177864A1
公开(公告)日：2016-06-23
申请号：US14905175
申请日：2014-07-24
发明人： Masato SASAKI , Norikazu TAKAHASHI
CPC分类号： F02F3/14 , B22F7/062 , B23K20/1215 , B23K20/128 , B23K2101/003 , C21D9/0068 , C22F1/00 , F02F3/00 , F02F3/003 , F02F3/26 , F16J1/01
摘要： Concave part is formed in a crown surface of the top of piston made of an aluminum alloy. This concave part is filled with mixed powder constituted of zirconia powder as a filler material and pure aluminum powder as a bonding material. Solid cylindrical rotary implement is brought into contact with concave part filled with mixed powder, and then pressed against piston under load while being rotated. Mixed powder is softened by frictional heat with rotary implement, whereby mixed powder is bound in a solid phase to concave part to form low thermal conductive part. With this, the bonding strength of low thermal conductive part to the crown surface of the top of the piston is improved.
摘要翻译： 凹形部分形成在由铝合金制成的活塞顶部的表面。 该凹部填充有作为填充材料的氧化锆粉末和作为粘结材料的纯铝粉末的混合粉末。 实心圆柱形旋转工具与填充有混合粉末的凹部接触，然后在转动的同时在负载下按压活塞。 混合粉末通过旋转工具的摩擦热软化，由此将混合粉末固定在固相到凹部以形成低导热部件。 由此，提高了低导热部件与活塞顶部表面的接合强度。
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公开(公告)号：US20130277005A1
公开(公告)日：2013-10-24
申请号：US13793364
申请日：2013-03-11
发明人： Masato SASAKI , Norikazu TAKAHASHI
CPC分类号： B22D17/02 , B22C9/10 , B22C9/105 , B22C9/108 , B22C9/22 , B22D17/24 , B22D18/02 , B22D19/0027 , B22D25/02 , F02B23/0696 , F02F3/22 , F02F2003/0007
摘要： An apparatus for producing a piston for an internal combustion engine by casting, the piston having a cooling channel therein, the apparatus including a fixed die with an upwardly opened cavity in which a core serving to form the cooling channel is to be disposed, a moveable die moveably disposed relative to the fixed die in a vertical direction and including a predetermined engaging portion, a guide die including an engaging portion engageable with the fixed die and having a same shape as that of the engaging portion of the moveable die, and a core retaining mechanism disposed in the guide die to retain the core in a predetermined position.
摘要翻译： 一种用于通过铸造制造用于内燃机的活塞的装置，所述活塞在其中具有冷却通道，所述装置包括具有向上开口腔的固定模具，其中将设置用于形成冷却通道的芯体，可移动的 相对于固定模具在垂直方向上可移动地设置并且包括预定的接合部分，引导模具，其包括可与固定模具接合并具有与可移动模具的接合部分相同形状的接合部分， 保持机构设置在引导模具中以将芯保持在预定位置。
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