公开(公告)号：US20180369954A1

公开(公告)日：2018-12-27

申请号：US15779810

申请日：2016-11-29

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Ittou SUGIMOTO ,  Hirotsugu KAWANAKA ,  Norikazu TAKAHASHI ,  Masato SASAKI

IPC: B23K20/12 ,  B23K20/24 ,  F02F3/00 ,  F02F3/10

Abstract: 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.

公开(公告)号：US20140255617A1

公开(公告)日：2014-09-11

申请号：US14201094

申请日：2014-03-07

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Masato SASAKI

IPC: F02F3/10

CPC classification number: F02F3/10

Abstract: Disclosed is a method for forming a double-layer, solid lubricant coating film on an external surface of a skirt portion of a piston in an internal combustion engine. This method includes the steps of (a) applying on the external surface of the skirt portion a solid lubricant composition containing a dark-color component, thereby forming thereon a precursor film; and (b) solidifying the precursor film by an irradiation with a laser beam from a laser oscillator, while moving at least one of the piston and the laser oscillator. It is possible by this method to form the double-layer, solid lubricant coating film with an extremely short period of time.

Abstract translation: 公开了一种在内燃机的活塞的裙部的外表面上形成双层固体润滑剂涂膜的方法。 该方法包括以下步骤：（a）在裙部的外表面上涂布含有深色成分的固体润滑剂组合物，从而在其上形成前体膜; 和（b）在移动活塞和激光振荡器中的至少一个的同时通过来自激光振荡器的激光束的照射使前体膜固化。 通过该方法可以在极短的时间内形成双层固体润滑剂涂膜。

公开(公告)号：US20170241372A1

公开(公告)日：2017-08-24

申请号：US15519875

申请日：2015-10-13

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Masato SASAKI

IPC: F02F3/12 ,  B23K20/12

CPC classification number: F02F3/12 ,  B23K20/1215 ,  B23K20/127 ,  B23K20/128 ,  B23K2101/003 ,  F02F2200/00

Abstract: In a method for producing a piston, a flat end surface 44a of a rotary tool 44 of a frictional pore sealing device is brought into abutment with the top surface 5a of a low thermal conductivity member 5 cast on the crown surface 2a of an aluminum alloy piston 1, and this rotary tool is pressed against the low thermal conductivity member's side with a load while rotating the rotary tool through an electric motor and a speed reduction mechanism. With this, a frictional heat between the top surface of the low thermal conductivity member and the end surface of the rotary tool causes to form a plastic flow layer 5d on the top surface, thereby sealing an opening portion of a pore 9a on the top surface of the porous member 6.

公开(公告)号：US20130205991A1

公开(公告)日：2013-08-15

申请号：US13753058

申请日：2013-01-29

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Masato SASAKI

IPC: F16J1/08 ,  B23P15/10

CPC classification number: F16J1/08 ,  B23P15/10 ,  F02F3/00 ,  F02F3/105 ,  F05C2225/06 ,  F05C2225/10 ,  F05C2251/14 ,  F05C2253/12 ,  Y10T29/49263

Abstract: A method of producing a piston includes a step of producing a naked piston having the skirt portion; a step of forming the skirt portion with streaks; a step of applying a skirt portion of the s naked piston with a first film forming paint which is provided for producing the inner solid lubricant film; a step of heating the first film forming paint on the skirt portion at a temperature of 60° C. to 160° C. for a time less than 800 seconds to dry the same; a step of applying an outer surface of the dried first film forming paint with a second film forming paint which is provided for producing the outer solid lubricant film; and a step of heating the first and second film forming paints on the skirt portion at a temperature of 160° C. to 240° C. for a time of 15 minutes to 180 minutes.

Abstract translation: 一种制造活塞的方法包括：制造具有裙部的裸露活塞的步骤; 用条纹形成裙部的步骤; 将裸露活塞的裙部应用于制造内部固体润滑剂膜的第一成膜涂料的步骤; 在60℃至160℃的温度下将裙部上的第一成膜涂料加热至少于800秒的步骤以使其干燥; 用干燥的第一成膜涂料的外表面施加用于制造外固体润滑剂膜的第二成膜涂料的步骤; 以及在160℃至240℃的温度下将裙部上的第一和第二成膜涂料加热15分钟至180分钟的步骤。

公开(公告)号：US20170350343A1

公开(公告)日：2017-12-07

申请号：US15536808

申请日：2015-10-13

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Masato SASAKI

IPC: F02F3/00 ,  B22C9/10

CPC classification number: F02F3/0084 ,  B22C9/108 ,  C03B19/06 ,  C03C11/007 ,  C03C14/004 ,  C03C2214/08 ,  F02F3/00 ,  F02F3/14 ,  F02F3/26 ,  F02F2200/00

Abstract: This piston includes a low thermal conductivity part comprising: a porous member made of a borosilicate glass that has a lower thermal conductivity than the piston base material made of an aluminum alloy material that is the base material impregnated into the porous member. A molded object obtained from a first powder (glass powder) and a second powder (sodium chloride powder) is put in hot water to dissolve away the second powder and form pores in the porous member. The aluminum alloy material is impregnated into these pores to unite the porous member to the piston base material. Furthermore, varnish containing polyimide, etc. is applied to the upper surface of the porous member and impregnated into the pores with a varnish impregnation device assisted by vacuum drawing and atmospheric pressure, thereby preventing the pores from remaining vacant. Due to this, deterioration in exhaust emission performance can be prevented.

公开(公告)号：US20180038309A1

公开(公告)日：2018-02-08

申请号：US15552826

申请日：2016-03-07

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Masato SASAKI

IPC: F02F3/10 ,  F16J1/08 ,  F16J1/01

CPC classification number: F02F3/10 ,  F02F2200/00 ,  F05C2251/14 ,  F16J1/01 ,  F16J1/08

Abstract: Provided is a piston of an internal combustion engine that can reduce a fluid lubrication frictional coefficient on an outer peripheral surface of a skirt portion. The piston of the internal combustion engine includes at least one electrodeposited film on the outer peripheral surface of the skirt portion that is slidably moved relative to an inner wall of a cylinder.

公开(公告)号：US20160177864A1

公开(公告)日：2016-06-23

申请号：US14905175

申请日：2014-07-24

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Masato SASAKI ,  Norikazu TAKAHASHI

IPC: F02F3/14 ,  F02F3/00 ,  C22F1/00 ,  C21D9/00 ,  B23K20/12 ,  B22F7/06

CPC classification number: F02F3/14 ,  B22F7/062 ,  B23K20/1215 ,  B23K20/128 ,  B23K2101/003 ,  C21D9/0068 ,  C22F1/00 ,  F02F3/00 ,  F02F3/003 ,  F02F3/26 ,  F16J1/01

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20130277005A1

公开(公告)日：2013-10-24

申请号：US13793364

申请日：2013-03-11

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Masato SASAKI ,  Norikazu TAKAHASHI

IPC: B22D25/02 ,  B22C9/22

CPC classification number: B22D17/02 ,  B22C9/10 ,  B22C9/105 ,  B22C9/108 ,  B22C9/22 ,  B22D17/24 ,  B22D18/02 ,  B22D19/0027 ,  B22D25/02 ,  F02B23/0696 ,  F02F3/22 ,  F02F2003/0007

Abstract: 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.

Abstract translation: 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。