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公开(公告)号：US20200340360A1
公开(公告)日：2020-10-29
申请号：US16760304
申请日：2019-09-05
Applicant: KYB Corporation
Inventor： Tetsuya IWANAJI
Abstract: A piston pump includes a first biasing mechanism configured to bias a swash plate in accordance with supplied control pressure, a second biasing mechanism configured to bias the swash plate against the first biasing mechanism, and a regulator configured to control the control pressure led to the first biasing mechanism in accordance with discharge pressure of the piston pump, wherein the second biasing mechanism has a pressure chamber to which the discharge pressure is led, and a control piston configured to be biased toward the swash plate by the discharge pressure led to the pressure chamber, and the regulator has a biasing member configured to bias the control piston toward the swash plate, and a control spool configured to be moved in accordance with biasing force of the biasing member, the control spool being configured to adjust fluid pressure.
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公开(公告)号：US20230204017A1
公开(公告)日：2023-06-29
申请号：US17999488
申请日：2021-03-11
Applicant: KYB Corporation
Inventor： Gen TAKEI , Tetsuya IWANAJI , Hiroaki KUBOI
IPC: F04B1/2078 , F04B1/306 , F04B1/32
CPC classification number: F04B1/2078 , F04B1/306 , F04B1/32
Abstract: A piston pump includes: a tilting mechanism configured to bias a swash plate in accordance with a control pressure; a support spring configured to support the swash plate; and a regulator configured to control a control pressure guided to the tilting mechanism in accordance with a self-pressure of the piston pump. The regulator has an outer spring and an inner spring configured to be extended and compressed by following tilting of the swash plate; and a control spool configured to be moved in accordance with a biasing force from the outer spring and the inner spring, the control spool being configured to regulate the control pressure, and the outer spring and the inner spring and the support spring are provided adjacent to each other and in parallel with respect to the swash plate.
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公开(公告)号：US20220154715A1
公开(公告)日：2022-05-19
申请号：US17439186
申请日：2020-02-13
Applicant: KYB Corporation
Inventor： Tetsuya IWANAJI , Hiroaki KUBOI , Rintaro MATSUDA
IPC: F04B49/12
Abstract: A pump displacement control device includes: a servo piston that changes a tilt angle; a flow rate control spool that is displaced corresponding to an input pressure; a power control spool that is displaced corresponding to a discharge pressure of the pump; a control pressure regulating spool that regulates a control pressure which controls the servo piston; and a feedback lever connected to the servo piston and the control pressure regulating spool. The feedback lever directly abut on either one of the flow rate control spool or the power control spool for regulating the control pressure.
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Patent Agency Ranking
公开(公告)号：US20170190249A1
公开(公告)日：2017-07-06
申请号：US15325104
申请日：2015-06-24
Applicant: KYB Corporation
Inventor： Takanori INADA , Tetsuya IWANAJI
IPC: B60K17/10 , F15B13/02 , F16H61/478 , F16H39/02 , F16H61/4017 , F16H61/4061 , F15B11/17 , F15B13/06
CPC classification number: B60K17/10 , F15B11/17 , F15B13/027 , F15B13/06 , F15B2211/20576 , F15B2211/25 , F16H39/02 , F16H61/4017 , F16H61/4061 , F16H61/478
Abstract: A hydraulic drive system includes: a first hydraulic motor and a second hydraulic motor configured to be driven by working oils respectively discharged from a first hydraulic pump and a second hydraulic pump; a first pump control unit and a second pump control unit configured to control discharge volumes and discharge directions of the first hydraulic pump and the second hydraulic pump; a signal pressure generating unit configured to generate a signal pressure for adjusting command pressures to control the first pump control unit and the second pump control unit in accordance with the sum of discharge pressures of the first hydraulic pump and the second hydraulic pump; and a first pressure adjusting unit and a second pressure adjusting unit configured to adjust the command pressures in accordance with the signal pressure.
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公开(公告)号：US20190301445A1
公开(公告)日：2019-10-03
申请号：US16307275
申请日：2017-05-23
Applicant: KYB Corporation
Inventor： Yuki SAKAI , Tetsuya IWANAJI
Abstract: A pump device includes a variable capacity first pump, a tilt actuator that controls a tilt angle of a swash plate of the first pump in accordance with the control pressure, a regulator that regulates the control pressure in accordance with a front-rear differential pressure of a control valve, a fixed capacity second pump driven by the same drive source as the first pump, the control actuator that operates in accordance with the front-rear differential pressure a resistor so as to drive the regulator to reduce the control pressure in response to an increase in the front-rear differential pressure of the resistor, an auxiliary passage that leads an auxiliary pressure to the control actuator, the auxiliary pressure acting on the control actuator against a upstream pressure of the resistor, and a switch valve that switches between connecting and shutoff the auxiliary passage.
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公开(公告)号：US20230122543A1
公开(公告)日：2023-04-20
申请号：US17906233
申请日：2021-03-11
Applicant: KYB Corporation
Inventor： Hiroaki KUBOI , Tetsuya IWANAJI
IPC: F04B1/324 , F04B1/2078
Abstract: A piston pump includes: a first biasing mechanism configured to bias a swash plate in accordance with control pressure supplied; a second biasing mechanism configured to bias the swash plate against the first biasing mechanism; and a regulator configured to control the control pressure in accordance with self-pressure of the piston pump. The regulator has: an outer spring and an inner spring configured to be extended and compressed by following tilting of the swash plate; a control spool configured to be moved in accordance with biasing forces exerted by the outer spring and the inner spring, the control spool being configured to adjust the control pressure; an auxiliary spring configured to exert biasing force to the control spool against the biasing forces exerted by the outer spring and the inner spring; and an adjusting mechanism configured to adjust the biasing force exerted by the auxiliary spring.
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公开(公告)号：US20220228578A1
公开(公告)日：2022-07-21
申请号：US17714477
申请日：2022-04-06
Applicant: KYB Corporation
Inventor： Tetsuya IWANAJI , Masaya ABE , Takeshi KODAMA
IPC: F04B1/2078 , F04B1/324 , F04B53/14 , F04B53/16
Abstract: A swash-plate type piston pump includes a cylinder block configured to be rotated with rotation of a driving shaft, a plurality of pistons accommodated in a plurality of cylinders provided in the cylinder block, a swash plate configured to reciprocate the piston so that a volume chamber of the cylinder is expanded/contracted with the rotation of the cylinder block, an biasing mechanism configured to bias the swash plate in a direction where a tilting angle is made larger, a control pin configured to drive the swash plate in a direction where the tilting angle is made smaller in accordance with a rise in a load pressure of a pressure chamber, and a discharge channel configured to discharge the load pressure of the pressure chamber.
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公开(公告)号：US20210285430A1
公开(公告)日：2021-09-16
申请号：US16316131
申请日：2017-03-31
Applicant: KYB Corporation
Inventor： Tetsuya IWANAJI , Masaya ABE , Takeshi KODAMA
IPC: F04B1/2078 , F04B53/16 , F04B53/14
Abstract: A swash-plate type piston pump includes a cylinder block configured to be rotated with rotation of a driving shaft, a plurality of pistons accommodated in a plurality of cylinders provided in the cylinder block, a swash plate configured to reciprocate the piston so that a volume chamber of the cylinder is expanded/contracted with the rotation of the cylinder block, an biasing mechanism configured to bias the swash plate in a direction where a tilting angle is made larger, a control pin configured to drive the swash plate in a direction where the tilting angle is made smaller in accordance with a rise in a load pressure of a pressure chamber, and a discharge channel configured to discharge the load pressure of the pressure chamber.
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