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1. 发明公开

EP4438862A1 SLIDING MEMBER 审中-实审
公开(公告)号：EP4438862A1
公开(公告)日：2024-10-02
申请号：EP22922060.3
申请日：2022-11-18
申请人： Kabushiki Kaisha Riken
发明人： MIYAHARA, Hiroyuki , KONDO, Masashi , MARUYAMA, Noriyoshi , TAKAHASHI, Ikurou
IPC分类号： F01L1/14
CPC分类号： F01L1/14
摘要： A sliding member according to the present invention is used in presence of lubricant oil, and includes a sliding surface made of a base material, and a recessed portion provided in the sliding surface, wherein the sliding surface satisfies a condition expressed by following Equation. 2≤α/Ra≤100
In Equation, α represents a ratio of a total volume of the recessed portion on the sliding surface to an area of a portion of the sliding surface in which the recessed portion is not formed, and Ra represents a center line average roughness of the sliding surface in the portion in which the recessed portion is not formed.

2. 发明公开

EP4435298A1 PISTON RING AND PISTON RING SET 审中-实审
公开(公告)号：EP4435298A1
公开(公告)日：2024-09-25
申请号：EP22915831.6
申请日：2022-12-20
申请人： Kabushiki Kaisha Riken
发明人： YAMADA, Takeshi
IPC分类号： F16J9/20 , F02F5/00 , F16J9/06
CPC分类号： F02F5/00 , F16J9/06 , F16J9/20
摘要： A piston ring includes an annular main body portion having an inner peripheral surface, an outer peripheral surface, and one side surface and the other side surface substantially orthogonal to the inner peripheral surface. The piston ring includes a first curved surface provided on a side of the one side surface of the outer peripheral surface, the first curved surface being convexly curved outwards in a radial direction of the main body portion, a second curved surface provided on a side of the other side surface of the outer peripheral surface, the second curved surface being convexly curved outwards in the radial direction of the main body portion, and an intermediate surface formed to extend in a direction connecting the one side surface to the other side surface connecting the first curved surface to the second curved surface. The intermediate surface has a flat portion formed in at least a part thereof. The width of the intermediate surface in the direction connecting the one side surface to the other side surface is 0.05 mm or more and 0.30 mm or less.

3. 发明公开

EP3967785A1 SPHEROIDAL GRAPHITE CAST IRON, METHOD FOR MANUFACTURING SPHEROIDAL GRAPHITE CAST IRON, AND PARTS FOR VEHICLE WHEEL PERIPHERY 审中-实审
公开(公告)号：EP3967785A1
公开(公告)日：2022-03-16
申请号：EP20802957.9
申请日：2020-04-14
申请人： Kabushiki Kaisha Riken
发明人： TOBITA Tomoyuki
IPC分类号： C22C37/04 , C21D5/00
摘要： Provided is a spheroidal graphite cast iron having high strength, high ductility, and high tenacity, particularly a spheroidal graphite cast iron having high strength with a high tensile strength of 700 MPa or more, exhibiting an elongation of 10 % or more, and exhibiting an absorbed energy of 10.0 J/cm 2 or more at room temperature. A spheroidal graphite cast iron having a chemical composition of: C: 3.0 % to 4.0 %, Si: 2.0 % to 2.4 %, Cu: 0.20 % to 0.50 %, Mn: 0.15 % to 0.35 %, S: 0.005 % to 0.030 %, Mg: 0.03 % to 0.06 %, each by mass, and the balance being Fe and inevitable impurities, where Mn and Cu are contained at 0.45 % to 0.75 % in total; and a structure in which a ferrite layer encloses spheroidal graphite crystallized out in a matrix of pearlite. Part of the pearlite is extended from the matrix side to the spheroidal graphite side to divide the ferrite layer at one or more areas.

4. 发明公开

EP3786493A1 PISTON RING 审中-公开
公开(公告)号：EP3786493A1
公开(公告)日：2021-03-03
申请号：EP19793208.0
申请日：2019-04-24
申请人： Kabushiki Kaisha Riken
发明人： KIMURA Takashi , SHIMA Yuji
IPC分类号： F16J9/26 , F02F5/00
摘要： To provide a piston ring excellent in thermal setting resistance, and also excellent in side surface wear resistance even under such a high-temperature high-pressure environment as to be more than 300°C and up to 400°C, the base metal of the piston ring is a steel containing, by mass%, C: 0.30 to 0.65%, Si: 0.80 to 1.20%, Mn: 0.20 to 0.60%, Cr: 4.50 to 5.70%, Cu: 0.01 to 0.5%, and at least one of Mo, V, W, and Co: 0.2 to 5.4%.

5. 发明授权

EP3279524B1 SIDE RAIL 失效
公开(公告)号：EP3279524B1
公开(公告)日：2020-11-11
申请号：EP16754954.2
申请日：2016-02-17
申请人： Kabushiki Kaisha Riken
发明人： SHIMIZU, Hiroshi , MURAYAMA, Katsumi
IPC分类号： F16J9/06 , F02F5/00 , F16J9/20 , F16J9/26

6. 发明授权

EP3270012B1 SIDE RAIL 有权
公开(公告)号：EP3270012B1
公开(公告)日：2020-08-05
申请号：EP16761290.2
申请日：2016-03-03
申请人： Kabushiki Kaisha Riken
发明人： TAKEZAWA, Yuichiro , MIYAJIMA, Tatsuya
IPC分类号： F16J9/20 , F02F5/00 , F16J9/06 , F16J9/26

7. 发明公开

EP3677764A1 SIDE RAIL 有权
公开(公告)号：EP3677764A1
公开(公告)日：2020-07-08
申请号：EP18865205.1
申请日：2018-09-25
申请人： Kabushiki Kaisha Riken
发明人： IWATA, Yasuhiro , SHIMIZU, Hiroshi , TAKEZAWA, Yuichiro
IPC分类号： F02F5/00 , F16J9/20
摘要： Provided is a side rail 1 having an outer peripheral surface 14 facing radially outward, an inner peripheral surface 13 facing radially inward, a first axial side surface 11 facing one side in an axial direction, and a second axial side surface 12 facing the other side in the axial direction and parallel to the first axial side surface 11, in which, a beveled portion 30 is provided between the outer peripheral surface 14 and the second axial side surface 12, the beveled portion 30 is formed in a tapered surface having a diameter gradually decreasing from a position on the outer peripheral surface 14 at 0.05 mm or more away from the first axial side surface toward the second axial side surface in the axial direction; a tapered surface 30a is provided between a first tapered surface portion 30a1 with an angle of 10° or more to the axial direction and a second tapered surface portion 30a2 provided between the first tapered surface portion 30a1 and the outer peripheral surface 14 and having a smaller angle of inclination to the axial direction than that of the first tapered surface portion.

8. 发明授权

EP3364078B1 SEAL RING 有权
公开(公告)号：EP3364078B1
公开(公告)日：2019-11-20
申请号：EP16855323.8
申请日：2016-10-05
申请人： Kabushiki Kaisha Riken
发明人： OHYA, Naohisa , HIRAYAMA, Daisuke , KAWASAKI, Takahiro
IPC分类号： F16J15/18 , F16J15/3272 , F16J15/34

9. 发明授权

EP2826983B1 COMBINATION OF CYLINDER AND PISTON RING 有权
公开(公告)号：EP2826983B1
公开(公告)日：2019-04-24
申请号：EP13761098.6
申请日：2013-03-05
申请人： Kabushiki Kaisha Riken
发明人： TSUJI Katsuhiro , SHINOHARA Akio , MORONUKI Masaki
IPC分类号： F02F5/00 , F02F1/00 , F16J9/26 , F16J10/00

10. 发明公开

EP3434939A1 COMBINED OIL CONTROL RING 审中-公开
公开(公告)号：EP3434939A1
公开(公告)日：2019-01-30
申请号：EP17770202.4
申请日：2017-03-21
申请人： Kabushiki Kaisha Riken
发明人： MOCHIZUKI Kazuya
IPC分类号： F16J9/06 , F02F5/00
摘要： To provide a combined oil control ring for an automobile engine which is capable of maintaining an outstanding oil control function without causing the occurrence of firm sticking between the spacer expander and the side rails even when the engine is operated over an extended period of time, the crest and the trough of the spacer expander are each provided with a seating tab for pressing an inner peripheral surface of the side rail, a projection for supporting the side rail, and a middle part between the seating tab and the projection, and a ratio (S min /S 0 ) is 1.9% or greater, where Smin is a minimum axial cross-sectional area of a space formed between the middle part and the side face of the side rail opposed thereto, and So is an axial cross-sectional area from a groove bottom of an oil ring groove of a piston, to which the combined oil control ring is attached, to an inner wall of a cylinder liner.

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