公开(公告)号：US11952988B2

公开(公告)日：2024-04-09

申请号：US17906233

申请日：2021-03-11

Applicant: KYB Corporation

Inventor： Hiroaki Kuboi ,  Tetsuya Iwanaji

IPC: F04B1/324 ,  F04B1/2078

CPC classification number: 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.

公开(公告)号：US11879452B2

公开(公告)日：2024-01-23

申请号：US17439186

申请日：2020-02-13

Applicant: KYB Corporation

Inventor： Tetsuya Iwanaji ,  Hiroaki Kuboi ,  Rintaro Matsuda

IPC: F04B49/12 ,  F04B49/00 ,  F04B1/122 ,  F04B49/08 ,  F04B49/22

CPC classification number: F04B49/12 ,  F04B1/122 ,  F04B49/002 ,  F04B49/08 ,  F04B49/22

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.

公开(公告)号：US11767832B2

公开(公告)日：2023-09-26

申请号：US17999488

申请日：2021-03-11

Applicant: KYB Corporation

Inventor： Gen Takei ,  Tetsuya Iwanaji ,  Hiroaki Kuboi

IPC: F04B1/2078 ,  F04B1/32 ,  F04B1/306

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.