公开(公告)号：US11052717B2

公开(公告)日：2021-07-06

申请号：US16478000

申请日：2018-01-26

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Yuki Yoshida

IPC: B60G17/015 ,  B60G17/052

Abstract: The present invention provides a suspension system capable of adjusting a vehicle height in a short time. The suspension system includes a front wheel-side suspension and a rear wheel-side suspension each provided between a vehicle body and an axle and configured to adjust a vehicle height according to supply and discharge of hydraulic fluid, a pressurization device configured to pressurize the hydraulic fluid, and a first tank and a second tank configured to store therein the hydraulic fluid pressurized by the pressurization device. When the suspension system lowers the vehicle height by each of the front wheel-side suspension and the rear wheel-side suspension, any one of the front wheel-side suspension and the rear wheel-side suspension discharges the hydraulic fluid to the first tank, and the other of the front wheel-side suspension and the rear wheel-side suspension discharges the hydraulic fluid into the second tank by the pressurization device.

公开(公告)号：US10967697B2

公开(公告)日：2021-04-06

申请号：US16086429

申请日：2017-03-15

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Yuki Yoshida ,  Kan Kobayashi

IPC: B60G17/052 ,  B60G17/04 ,  B60G17/056

Abstract: An air suspension system capable of raising both the vehicle front wheel side and the vehicle rear wheel side by using a single tank. The air suspension system (1) includes a front wheel-side air suspension (2) and a rear wheel-side air suspension (7) which are interposed between a vehicle body and associated axles to perform vehicle height adjustment in response to supply and discharge of air, a compressor (17) for compressing air, and a tank (27) for storing air compressed by the compressor. When the vehicle height is to be raised by the air suspensions, the front wheel-side air suspension is supplied with compressed air from the tank, and the rear wheel-side air suspension is supplied with compressed air from the tank after the compressed air has been pressurized by the compressor.

公开(公告)号：US10682894B2

公开(公告)日：2020-06-16

申请号：US15562161

申请日：2015-05-29

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Tsutomu Ito ,  Shunsuke Mori ,  Tomoyuki Lee ,  Tsutomu Iwamura ,  Yuki Yoshida

IPC: B60G17/052 ,  B60G17/048 ,  B60G11/27 ,  B60G17/015

Abstract: A replenishment passage connects a compressor to a tank, and a first check valve is provided in the middle of the replenishment passage. A supply/discharge passage connects the tank to air suspensions. A supply/discharge switching valve is provided in the middle of the supply/discharge passage, and suspension control valves are provided at a location between the supply/discharge switching valve and the air suspensions. A discharge passage connects the supply/discharge switching valve to a suction port of the compressor, and a discharge passage open/close valve is provided in the middle of the discharge passage. When a vehicle height is lowered, air within the air suspensions is guided to the suction port of the compressor through the discharge passage, compressed by the compressor, and supplied into the tank.