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公开(公告)号：US11047353B2
公开(公告)日：2021-06-29
申请号：US16769952
申请日：2018-11-20
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Atsuji Saito , Satoshi Usui , Kazuaki Tokumaru
Abstract: Provided is a high-pressure fuel supply pump capable of reducing a manufacturing cost of a part for holding a metal damper. The high-pressure fuel supply pump includes a pump body 1 having a pressurizing chamber 11 therein, a damper cover 14 forming a damper chamber 10 together with the pump body 1 on the upstream side of the pressurizing chamber 11, a metal damper 9 that is disposed in the damper cover 10 and formed by laminating two metal diaphragms, and a first holding member 9a that is disposed in the damper chamber 10 and presses and holds the metal damper 9 from one side. The first holding member 9a includes a first regulation portion that regulates the radial movement of the metal damper 9, and a second regulation portion that regulates the radial movement of the first holding member 9a in the damper chamber 10. At a position of the second regulation portion, a flow path is formed which allows the fuel in the damper chamber 10 to circulate to both surfaces of the metal damper 9.
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公开(公告)号：US10337480B2
公开(公告)日：2019-07-02
申请号：US15580480
申请日：2016-08-01
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Kenichiro Tokuo , Ryo Kusakabe , Shunsuke Aritomi , Satoshi Usui , Masayuki Suganami , Minoru Hashida , Masamichi Yagai , Yuta Saso , Atsuji Saito
Abstract: Provided is a high-pressure fuel pump in which responsiveness of closing a suction valve can be maintained even when the high-pressure fuel pump is increased in pressure or capacity of the high-pressure fuel pump is increased, thereby ensuring discharge efficiency. Therefore, the high-pressure fuel pump includes the rod that urges the suction valve in the valve opening direction, the mover that drives the rod in the valve closing direction, and the solenoid that generates a magnetic attraction force for moving the mover in the valve closing direction. After the suction valve starts moving from the suction valve closing position in the valve opening direction, the rod reaches the suction valve closing position and further moves in the valve opening direction.
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公开(公告)号：US10294907B2
公开(公告)日：2019-05-21
申请号：US15506040
申请日：2015-06-29
Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
Inventor： Minoru Hashida , Hiroyuki Yamada , Satoshi Usui , Kenichirou Tokuo , Masayuki Suganami , Atsushi Hohkita , Masamichi Yagai
Abstract: A high pressure fuel supply pump includes: an electromagnetic suction valve that adjusts an amount of fuel sucked into a pressuring chamber; a discharge valve that discharges the fuel from the pressuring chamber; and a plunger that makes a reciprocating motion in the pressuring chamber. The electromagnetic suction valve includes an electromagnetic coil, a suction valve, and a movable portion that is able to close the suction valve by a magnetic force when the electromagnetic coil is energized. The movable portion includes an anchor that is driven to close the suction valve by the magnetic force and stops at a fixed member, and a rod that is driven with the anchor and is able to move even after the anchor stops. The electromagnetic suction valve includes a first and second springs that bias the suction valve in closed and open direction, respectively, and a third spring in the rod.
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公开(公告)号：US11248573B2
公开(公告)日：2022-02-15
申请号：US16627921
申请日：2018-06-25
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Moritsugu Akiyama , Satoshi Usui , Hiroyuki Yamada , Shigehiko Omata , Masashi Nemoto
Abstract: Provided is a high-pressure fuel pump that ensures oil tightness even at high fuel pressure and has a small and lightweight inexpensive discharge valve structure. Therefore, a high-pressure fuel pump according to the present invention includes: a discharge valve arranged on a discharge side of a pressurizing chamber; a discharge valve seat on which the discharge valve is seated; and a facing member configured independently as a separate member from the discharge valve seat and located on an opposite side of the discharge valve seat with the discharge valve interposed therebetween, in which a stroke direction regulating portion that regulates displacement of the discharge valve in a stroke direction is formed on a tapered surface of the facing member.
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公开(公告)号：US11047380B2
公开(公告)日：2021-06-29
申请号：US16126774
申请日：2018-09-10
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Satoshi Usui , Shingo Tamura , Katsumi Miyazaki , Sunao Takahashi , Masayuki Suganami , Minoru Hashida
Abstract: A high pressure fuel pump includes a pump housing, pressure and damper chambers, a metal diaphragm, a press-fitted portion, and a weld portion. The pressure chamber is provided in the pump housing. The damper chamber is formed by the pump housing and a damper cover. The metal diaphragm damper is arranged in the damper chamber. At the press-fitted portion, an annular surface of the damper cover is press fitted to an annular surface of the pump housing. The weld portion fixes the damper cover to the pump housing at an entire circumference of the press-fitted portion.
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Patent Agency Ranking
公开(公告)号：US11002236B2
公开(公告)日：2021-05-11
申请号：US16342278
申请日：2017-10-26
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Atsuji Saito , Satoshi Usui , Minoru Hashida , Masayuki Suganami , Hiroyuki Yamada , Kenichiro Tokuo , Masamichi Yagai , Yuta Saso
Abstract: An object of the present invention is to supply a high-pressure fuel supply pump capable of holding a spring holding member while reducing the height of the pump body.
A high-pressure fuel supply pump is provided with a pump body for forming a pressurizing chamber at an inner wall portion, and a flange portion for fixing the pump body to a high-pressure fuel supply pump mounting portion. The high-pressure fuel supply pump is provided with a cylinder and a spring holding member. The cylinder is inserted into a hole portion of the pump body from a lower side and in which the pressurizing chamber is formed further above an uppermost end surface. The spring holding member has an outer peripheral portion press-fitted and fixed to the pump body and a holding portion holding a spring portion for biasing the pump body between the outer peripheral portion and the inner peripheral portion. A spring-side lowest end portion of the holding surface of the spring holding member is disposed above the lowermost end portion of the flange portion.-
公开(公告)号：US10890151B2
公开(公告)日：2021-01-12
申请号：US16603072
申请日：2018-03-26
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Kazuaki Tokumaru , Masahiko Hayatani , Satoshi Usui , Atsuji Saito , Kenichiro Tokuo , Masamichi Yagai , Masayuki Suganami
Abstract: Provided is a high-pressure fuel pump which can fix a cylinder to a pump body using a simple structure, and can reduce a displacement amount inward in a radial direction of the cylinder. A high-pressure fuel pump includes a pump body which is formed with a pressing chamber and a cylinder which is inserted in a hole formed in the pump body. The cylinder is swaged to the hole by pressing a convex portion on an outside in a radial direction to fit into the hole on an opposite side to the pressing chamber, by screwing a formed screw thread into the hole, or by being swaged with the opposite side to the pressing chamber. The cylinder is formed with a clearance in the radial direction with respect to the hole of the pump body all over a region from a bonding portion to an upper end.
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公开(公告)号：US10851767B2
公开(公告)日：2020-12-01
申请号：US16238807
申请日：2019-01-03
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Shunsuke Aritomi , Kenichirou Tokuo , Satoshi Usui , Shingo Tamura
IPC: F04B19/22 , F02M59/10 , F02M59/44 , F04B1/0421 , F04B1/0448
Abstract: A pump for supplying high-pressure includes a plunger, a cylinder, a body, and a holder. The uppermost end surface of the cylinder is an end of the cylinder that is closest to the pressurizing chamber. A first gap formed between the outer periphery of the cylinder and the body in the radial direction is smaller than a second gap formed in the radial direction between the inner diameter of the pressurizing chamber and the outer diameter of the plunger. A radial gap is formed in an entire area of the cylinder in an axial direction thereof.
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公开(公告)号：US10851751B2
公开(公告)日：2020-12-01
申请号：US16603072
申请日：2018-03-26
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Kazuaki Tokumaru , Masahiko Hayatani , Satoshi Usui , Atsuji Saito , Kenichiro Tokuo , Masamichi Yagai , Masayuki Suganami
Abstract: Provided is a high-pressure fuel pump which can fix a cylinder to a pump body using a simple structure, and can reduce a displacement amount inward in a radial direction of the cylinder. A high-pressure fuel pump includes a pump body which is formed with a pressing chamber and a cylinder which is inserted in a hole formed in the pump body. The cylinder is swaged to the hole by pressing a convex portion on an outside in a radial direction to fit into the hole on an opposite side to the pressing chamber, by screwing a formed screw thread into the hole, or by being swaged with the opposite side to the pressing chamber. The cylinder is formed with a clearance in the radial direction with respect to the hole of the pump body all over a region from a bonding portion to an upper end.
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公开(公告)号：US10683835B2
公开(公告)日：2020-06-16
申请号：US16449771
申请日：2019-06-24
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Yuta Saso , Atsuji Saito , Satoshi Usui , Shingo Tamura , Moritsugu Akiyama , Hiroyuki Yamada , Atsushi Hohkita
Abstract: A fuel pump includes an electromagnetically driven intake valve mechanism, a pump housing, a discharge valve, an opening, a seal member, and a first relief passage. The relief valve mechanism has a relief valve, a relief valve seat contacting the relief valve when the relief valve is closed and a relief spring biasing the relief valve against the relief valve seat. A second relief passage, communicating the first relief passage and a hole formed in the relief seat, is formed between the seal member and the relief valve seat. The relief valve seat, the relief valve, and the relief spring are arranged in this order beginning from the open end side.
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