5-12-10, Honmachi-Higashi, Chuo-ku, Saitama City, Saitama, 338-8503, Japan
Business Overview
-A manufacturer specializing in internal combustion parts, including piston rings, valve seats, and valve train parts.
-Riken Corporation(Riken) andNippon Piston Ring Co., Ltd.(NPR) announced that they have established a wholly owning parent company of both companies, NPR-RIKEN Corporation, through a joint share transfer.
-Sales generated by the automotive products business account for 85.2% of the Company’s total consolidated sales.
Established as Nippon Piston Ring in Shiba-ku, Tokyo. Set up the Kawaguchi Plant.
Apr. 1939
Opened the Yono Plant.
May 1949
Listed on the First Sections of both the Tokyo and Osaka Stock Exchanges.
Feb. 1960
Headquarters moved to Chiyoda-ku, Tokyo.
June, 1964
Established Nippon Ring Service.
May, 1998
Headquarters moved to Yono, Saitama.
Oct. 1998
NPR Fukushima and NPR Iwate received the TPM Award.
Jan. 1999
Yono Plant ISO9001 certified.
Nov. 1999
Tochigi Plant received the TPM Award.
Jan. 2000
Automotive piston ring business received QS9000 certification.
Feb. 2000
NPR Fukushima Works Co., Ltd. received ISO9001 certification.
Dec. 2000
Received ISO14001 certification at the headquarters.
Dec. 2000
NPR Fukushima Works Co., Ltd. received QS9000 certification.
Sep. 2001
Tochigi Plant received ISO9001 and QS9000 certifications.
Nov. 2001
NPR Fukushima Works Co., Ltd. received ISO14001 certification.
Dec. 2001
Acquired 100 percent ownership of Siam NPR Co., Ltd. in Thailand.
May 2002
Tochigi Plant received ISO14001 certification.
Sep. 2002
NPR Iwate Co., Ltd.'s Ichinoseki plant started partial operations.
Feb. 2003
The whole domestic operations were ISO14001 certified.
Aug. 2004
Established NPR Manufacturing Michigan Inc. in the U.S.A.
Oct. 2004
The whole domestic operations were ISO/TS16949:2002 certified.
Feb. 2005
Established NPR Auto Parts Manufacturing (Yizheng) Co., Ltd. in China.
Mar. 2006
Established NPR Manufacturing Indonesia Inc. in Indonesia.
Apr. 2006
Established NPR Auto Parts Manufacturing (Jiangsu) Co., Ltd. in China.
May 2006
Established NPR Manufacturing Kentucky, LLC in the U.S.A.
Jun. 2006
Established NPR US Holdings in the U.S.A.
Sep. 2007
Signed an agreement forming a global business alliance with KS Kolbenschmidt GmbH based in Germany.
Jan. 2011
Merged operations of NPR of America, LLC; NPR Manufacturing Michigan LLC; and NPR Manufacturing Kentucky, LLC into NPR US Holdings, and established NPR of America, Inc.
Mar. 2011
Acquired 100 percent ownership of NPR Shimane Co., Ltd.
Dec. 2011
Established NPR Auto Parts Manufacturing India Pvt. Ltd.
Mar. 2012
Merged the operations of NPR Kawaguchi Works and NPR Logistics Center.
Jul. 2012
Dissolved the operations of NPR Auto Parts Manufacturing (Zhenjiang) Co., Ltd. and merged them into NPR Auto Parts Manufacturing (Yizheng) Co., Ltd., which became the surviving company.
Dec. 2012
Established NPR Powdered Materials Manufacturing (Yizheng) Co., Ltd. in China.
July 2013
Dissolved joint venture contract with TPR for PT.NT Piston Ring Indonesia, and acquired a 100 percent ownership in PT.NT Piston Ring Indonesia.
Oct. 2013
Converted NPR Powdered Materials Manufacturing (Yizheng) Co., Ltd. into a joint venture with ASIMCO Shuanghuan Piston Ring Co., Ltd. (Yizheng) (currently called ASIMCO Shuanghuan Piston Ring (Yizheng) Co., Ltd.) Changed the joint venture’s name to Yizheng NPR ASIMCO Powder Metallurgy Manufacturing Co., Ltd.
May 2014
Acquired the powder metallurgic ejection-molding business from Sumitomo Metal Mining Co.
Oct. 2018
Transferred some of the shares of its wholly-owned subsidiary, NPR of Europe GmbH (NPR of Europe), to Daido Metal Co., Ltd.
-Demonstrator that changes the motor characteristics by adjusting the air gap between the rotor and stator.
-By adjusting the air gap, it is possible to cover from the high RPM range to the high torque range with a single motor.
Automotive World 2022 Variable gap demonstrator
-Demonstrator that changes the motor characteristics by adjusting the air gap between the rotor and stator.
-By adjusting the air gap, it is possible to cover from the high RPM range to the high torque range with a single motor.
Automotive World 2022 Variable gap demonstrator
-Demonstrator that changes the motor characteristics by adjusting the air gap between the rotor and stator.
-By adjusting the air gap, it is possible to cover from the high RPM range to the high torque range with a single motor.
Automotive World 2022 Variable gap demonstrator
-Demonstrator that changes the motor characteristics by adjusting the air gap between the rotor and stator.
-By adjusting the air gap, it is possible to cover from the high RPM range to the high torque range with a single motor.
Automotive World 2022 Powdered iron cores
-Iron motor cores made by pressing soft magnetic powder insulated grain by grain.
-Compared to laminated steel sheet, it has features such as greater flexibility in shape, less eddy current loss, and the ability to form isotropic magnetic paths.
Automotive World 2022 Powdered iron cores
-Iron motor cores made by pressing soft magnetic powder insulated grain by grain.
-Compared to laminated steel sheet, it has features such as greater flexibility in shape, less eddy current loss, and the ability to form isotropic magnetic paths.
Automotive World 2022 Powdered iron cores
-Iron motor cores made by pressing soft magnetic powder insulated grain by grain.
-Compared to laminated steel sheet, it has features such as greater flexibility in shape, less eddy current loss, and the ability to form isotropic magnetic paths.
Automotive World 2022 Powdered iron cores
-Iron motor cores made by pressing soft magnetic powder insulated grain by grain.
-Compared to laminated steel sheet, it has features such as greater flexibility in shape, less eddy current loss, and the ability to form isotropic magnetic paths.
Automotive World 2022 Powdered iron cores
-Iron motor cores made by pressing soft magnetic powder insulated grain by grain.
-Compared to laminated steel sheet, it has features such as greater flexibility in shape, less eddy current loss, and the ability to form isotropic magnetic paths.
Automotive World 2022 Powdered iron cores
-Iron motor cores made by pressing soft magnetic powder insulated grain by grain.
-Compared to laminated steel sheet, it has features such as greater flexibility in shape, less eddy current loss, and the ability to form isotropic magnetic paths.
MarkLines Online Expo 2021 Powder Magnetic Core for Axial Gap Motor - Application: In-wheel Motor for Small EV
This product has features such as freedom of section form design, small eddy current loss, and non-oriented magnetic path. In the case of the same body size, higher torque can be achieved, and in the case of the same torque, smaller size and lighter weight can be achieved.
MarkLines Online Expo 2021 Powder Magnetic Core for Axial Gap Motor - Application: In-wheel Motor for Small EV
This product has features such as freedom of section form design, small eddy current loss, and non-oriented magnetic path. In the case of the same body size, higher torque can be achieved, and in the case of the same torque, smaller size and lighter weight can be achieved.
MarkLines Online Expo 2021 Powder Magnetic Core for Axial Gap Motor - Application: In-wheel Motor for Small EV
This product has features such as freedom of section form design, small eddy current loss, and non-oriented magnetic path. In the case of the same body size, higher torque can be achieved, and in the case of the same torque, smaller size and lighter weight can be achieved.
MarkLines Online Expo 2021 Powder Magnetic Core for Axial Gap Motor - Application: In-wheel Motor for Small EV
This product has features such as freedom of section form design, small eddy current loss, and non-oriented magnetic path. In the case of the same body size, higher torque can be achieved, and in the case of the same torque, smaller size and lighter weight can be achieved.
Automotive World 2021 Powdered iron cores
-Pressed powdered core for thin and highly efficient axial gap motors. By molding the iron core using pressed powder, the degree of freedom in shape is increased and a higher current can be achieved.
Automotive World 2021 Powdered iron cores
-Pressed powdered core for thin and highly efficient axial gap motors. By molding the iron core using pressed powder, the degree of freedom in shape is increased and a higher current can be achieved.
Automotive World 2021 Powdered iron cores
-Pressed powdered core for thin and highly efficient axial gap motors. By molding the iron core using pressed powder, the degree of freedom in shape is increased and a higher current can be achieved.
Automotive World 2021 Powdered iron cores
-Pressed powdered core for thin and highly efficient axial gap motors. By molding the iron core using pressed powder, the degree of freedom in shape is increased and a higher current can be achieved.
Automotive World 2021 In-wheel motor
Automotive World 2021 In-wheel motor
Automotive World 2021 Compact in-wheel motor
Automotive World 2021 Compact in-wheel motor
Automotive World 2021 Compact axial gap motor
Automotive World 2021 Compact axial gap motor
Automotive World 2021 Ultra-compact axial gap motor
Automotive World 2020 Axial Gap Motor
- Uses a powder iron core that has a high degree of freedom, low eddy current loss, and non-oriented magnetic path.
- Features narrow width and high torque.
- Mounted on minicar that ran as lead car in Japan Ekiden relay race.
Automotive World 2020 Axial Gap Motor
- Uses a powder iron core that has a high degree of freedom, low eddy current loss, and non-oriented magnetic path.
- Features narrow width and high torque.
- Mounted on minicar that ran as lead car in Japan Ekiden relay race.
Automotive World 2020 Axial Gap Motor
- Uses a powder iron core that has a high degree of freedom, low eddy current loss, and non-oriented magnetic path.
- Features narrow width and high torque.
- Mounted on minicar that ran as lead car in Japan Ekiden relay race.
Automotive World 2020 Axial Gap Motor
- Uses a powder iron core that has a high degree of freedom, low eddy current loss, and non-oriented magnetic path.
- Features narrow width and high torque.
- Mounted on minicar that ran as lead car in Japan Ekiden relay race.
Automotive World 2020 Axial Gap Motor
- Uses a powder iron core that has a high degree of freedom, low eddy current loss, and non-oriented magnetic path.
- Features narrow width and high torque.
- Mounted on minicar that ran as lead car in Japan Ekiden relay race.
Automotive World 2020 Axial Gap Motor
- Uses a powder iron core that has a high degree of freedom, low eddy current loss, and non-oriented magnetic path.
- Features narrow width and high torque.
- Mounted on minicar that ran as lead car in Japan Ekiden relay race.
Automotive World 2020 Axial Gap Motor
- Uses a powder iron core that has a high degree of freedom, low eddy current loss, and non-oriented magnetic path.
- Features narrow width and high torque.
- Mounted on minicar that ran as lead car in Japan Ekiden relay race.
Automotive World 2020 Small in-wheel motor
- Axial type high torque motor.
Automotive World 2020 Small in-wheel motor
- Axial type high torque motor.
Automotive World 2020 Small in-wheel motor
- Axial type high torque motor.
Automotive World 2020 Small in-wheel motor
- Axial type high torque motor.
Automotive World 2020 Powder iron core
- Higher degree freedom in shape than iron sheet core; eddy current loss can be suppressed. Further, a non-directional magnetic path can be formed.
Automotive World 2020 Powder iron core
- Higher degree freedom in shape than iron sheet core; eddy current loss can be suppressed. Further, a non-directional magnetic path can be formed.
Automotive World 2020 Powder iron core
- Higher degree freedom in shape than iron sheet core; eddy current loss can be suppressed. Further, a non-directional magnetic path can be formed.
Automotive World 2020 Powder iron core
- Higher degree freedom in shape than iron sheet core; eddy current loss can be suppressed. Further, a non-directional magnetic path can be formed.
Automotive World 2020 Powder iron core
- Higher degree freedom in shape than iron sheet core; eddy current loss can be suppressed. Further, a non-directional magnetic path can be formed.
Automotive World 2020 Powder iron core
- Higher degree freedom in shape than iron sheet core; eddy current loss can be suppressed. Further, a non-directional magnetic path can be formed.
Automotive World 2020 Powder iron core
- Higher degree freedom in shape than iron sheet core; eddy current loss can be suppressed. Further, a non-directional magnetic path can be formed.
Automotive World 2020 Metal powder injection molding (MIM) process
Automotive World 2020 Metal powder injection molding (MIM) process
Automotive World 2020 Metal powder injection molding (MIM) process
Automotive World 2020 Metal powder injection molding (MIM) process
Automotive World 2020 Metal powder injection molding (MIM) process
Tokyo Motor Show 2019 Valve seat inserts
- For motorcycles (left)
- For passenger cars (2nd from left and middle)
- For diesel engines (2nd from right and right)
Tokyo Motor Show 2019 Valve seat inserts
- For motorcycles (left)
- For passenger cars (2nd from left and middle)
- For diesel engines (2nd from right and right)
Tokyo Motor Show 2019 2-layer valve seat insert cross-section
Tokyo Motor Show 2019 Composite sintered camshafts
- Made by the technique of compound sintering a cam lob made of sintered alloy on a steel pipe.
- Installed vehicle: Honda NSX (above)
- Installed application: Subaru horizontally opposed engine (middle and lower)
Tokyo Motor Show 2019 Composite sintered camshafts
- Made by the technique of compound sintering a cam lob made of sintered alloy on a steel pipe.
- Installed vehicle: Honda NSX (above)
- Installed application: Subaru horizontally opposed engine (middle and lower)
Tokyo Motor Show 2019 Composite sintered camshafts
- Made by the technique of compound sintering a cam lob made of sintered alloy on a steel pipe.
- Installed vehicle: Honda NSX (above)
- Installed application: Subaru horizontally opposed engine (middle and lower)
Tokyo Motor Show 2019 Composite sintered camshafts
- Made by the technique of compound sintering a cam lob made of sintered alloy on a steel pipe.
- Installed vehicle: Honda NSX (above)
- Installed application: Subaru horizontally opposed engine (middle and lower)
Tokyo Motor Show 2019 Dimpled cylinder liner
- By reducing piston ring contact surface, friction is reduced.
- Being used by Hino and Isuzu
Tokyo Motor Show 2019 Dimpled cylinder liner
- By reducing piston ring contact surface, friction is reduced.
- Being used by Hino and Isuzu
Tokyo Motor Show 2019 Dimpled cylinder liner
- By reducing piston ring contact surface, friction is reduced.
- Being used by Hino and Isuzu
Tokyo Motor Show 2019 Dimpled cylinder liner
- By reducing piston ring contact surface, friction is reduced.
- Being used by Hino and Isuzu
Tokyo Motor Show 2019 Powder metal injection molding (MIM) process
- Parts made using MIM (metal injection molding)
- Trade name Metamold
Tokyo Motor Show 2019 Powder metal injection molding (MIM) process
- Parts made using MIM (metal injection molding)
- Trade name Metamold
Tokyo Motor Show 2019 Powder metal injection molding (MIM) process
- Parts made using MIM (metal injection molding)
- Trade name Metamold
Tokyo Motor Show 2019 Powder metal injection molding (MIM) process
- Parts made using MIM (metal injection molding)
- Trade name Metamold
Tokyo Motor Show 2019 Powder metal injection molding (MIM) process
- Parts made using MIM (metal injection molding)
- Trade name Metamold
Tokyo Motor Show 2019 Powder metal injection molding (MIM) process
- Parts made using MIM (metal injection molding)
- Trade name Metamold
2019 JSAE Automotive Engineering Exposition DLC piston ring
2019 JSAE Automotive Engineering Exposition DLC piston ring
2019 JSAE Automotive Engineering Exposition Axial Gap Type In-Wheel Motor
2019 JSAE Automotive Engineering Exposition Axial Gap Type In-Wheel Motor
2019 JSAE Automotive Engineering Exposition SINTERED PARTS
2019 JSAE Automotive Engineering Exposition SINTERED PARTS
2019 JSAE Automotive Engineering Exposition SINTERED PARTS/METAL INJECTION MOLDING PARTS
2019 JSAE Automotive Engineering Exposition SINTERED PARTS/METAL INJECTION MOLDING PARTS
Automotive World 2019 Small EV
-Installed motor which developed by the Company
Automotive World 2019 Small EV
-Installed motor which developed by the Company
Automotive World 2019 Axial Gap type In-Wheel Electric Motor
-Direct drive is available. Also applicable to wheelchairs, carts, etc. including small car etc
Automotive World 2019 Axial Gap type In-Wheel Electric Motor
-Direct drive is available. Also applicable to wheelchairs, carts, etc. including small car etc
Automotive World 2019 Axial Gap type In-Wheel Electric Motor
-Direct drive is available. Also applicable to wheelchairs, carts, etc. including small car etc
Automotive World 2019 Axial Gap type Electric Motor (Small Size)
Automotive World 2019 Axial Gap type Electric Motor (Small Size)
Automotive World 2019 3D SMC Core
- Motor core that can be freely changed in shape used for axial gap type motors
Automotive World 2019 Metamold Sintered parts / Metal injection molding pars
- Method of mixing special material with metal powder, heating, removing the mixture after injection molding. It is possible to mass production of extremely small metal parts.
Automotive World 2019 Metamold Sintered parts / Metal injection molding pars
- Method of mixing special material with metal powder, heating, removing the mixture after injection molding. It is possible to mass production of extremely small metal parts.
Automotive World 2019 Piston ring
Automotive World 2018 Stator
SMC Core・Magnetic Steel Core
Automotive World 2018 Stator
SMC Core・Magnetic Steel Core
Automotive World 2018 High termal conductivity/DLC piston ring
Automotive World 2018 High termal conductivity/DLC piston ring
Tokyo Motor Show 2017 DLC Coating Ring
Tokyo Motor Show 2017 DLC Coating Ring
Tokyo Motor Show 2017 DLC Coating Ring
Tokyo Motor Show 2017 DLC Coating Ring
Tokyo Motor Show 2017 DLC Coating Ring
Tokyo Motor Show 2017 Axial gap motor
Tokyo Motor Show 2017 Axial gap motor
Tokyo Motor Show 2017 Axial gap motor
Tokyo Motor Show 2017 Axial gap motor
Tokyo Motor Show 2017 Cylinder Liner
Tokyo Motor Show 2017 Cylinder Liner
Tokyo Motor Show 2017 Cylinder Liner
Tokyo Motor Show 2017 Cylinder Liner
Tokyo Motor Show 2017 Piston Rings
Tokyo Motor Show 2017 Valve Seat Inserts
Tokyo Motor Show 2017 Composite Sintered Camshafts
Tokyo Motor Show 2017 Sintered Parts
Tokyo Motor Show 2017 Metal Injection Molding Parts (METAMOLD)
2017 JSAE Automotive Engineering Exposition Sintered Parts
2017 JSAE Automotive Engineering Exposition Sintered Parts
2017 JSAE Automotive Engineering Exposition Sintered Parts
2017 JSAE Automotive Engineering Exposition Sintered Parts
2017 JSAE Automotive Engineering Exposition Sintered Parts
2017 JSAE Automotive Engineering Exposition Sintered Parts
2017 JSAE Automotive Engineering Exposition Sintered Parts
