Fluid systems for machines with integrated energy recovery circuit
US-9945396-B2 · Apr 17, 2018 · US
Hydraulic driving device of work machine
US10184228B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10184228-B2 |
| Application number | US-201715447836-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 2, 2017 |
| Priority date | Sep 29, 2016 |
| Publication date | Jan 22, 2019 |
| Grant date | Jan 22, 2019 |
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- Title
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Abstract
Official abstract text for this publication.
To keep operability of a hydraulic actuator excellent even in a state pressure has been sufficiently accumulated in a pressure accumulator. In a hydraulic driving device of a work machine including a hydraulic actuator, a tank, a flow control valve, and a pressure accumulator, there are further provided with a first pressure compensation valve that is for controlling difference between front and back pressures of the flow control valve constant and a second pressure compensation valve that is arranged between the pressure accumulator and the tank and is for controlling difference between front and back pressures of the flow control valve and the first pressure compensation valve constant.
First claim
Opening claim text (preview).
What is claimed is: 1. A hydraulic driving device of a work machine, comprising: a hydraulic actuator that is operated by hydraulic oil supplied; a tank that stores return oil from the hydraulic actuator; a flow control valve for making hydraulic oil discharged from the hydraulic actuator flow toward the tank; and a pressure accumulator that accumulates pressure of the hydraulic oil that flows from the flow control valve toward the tank, wherein there are provided: a first pressure compensation valve that is arranged between the hydraulic actuator and the pressure accumulator and is for controlling difference between front and back pressures of the flow control valve constant; and a second pressure compensation valve that is arranged between the pressure accumulator and the tank and is for controlling difference between front and back pressures of the flow control valve and the first pressure compensation valve constant. 2. The hydraulic driving device of a work machine according to claim 1 , wherein the first pressure compensation valve is arranged on the upstream side of the flow of hydraulic oil discharged from the hydraulic actuator with respect to the flow control valve, and the second pressure compensation valve controls difference between front pressure of the first pressure compensation valve and back pressure of the flow control valve constant. 3. The hydraulic driving device of a work machine according to claim 2 , wherein first target differential pressure set for the first pressure compensation valve and second target differential pressure set for the second pressure compensation valve are equal. 4. The hydraulic driving device of a work machine according to claim 1 , wherein the first pressure compensation valve is arranged on the downstream side of the flow of hydraulic oil discharged from the hydraulic actuator with respect to the flow control valve, and the second pressure compensation valve controls difference between front pressure of the flow control valve and back pressure of the first pressure compensation valve constant. 5. The hydraulic driving device of a work machine according to claim 4 , wherein first target differential pressure set for the first pressure compensation valve is equal to or less than second target differential pressure set for the second pressure compensation valve.
Assignees
Inventors
Classifications
Energy-recuperation means · CPC title
Arrangements or adaptations of elements for hydraulic drives · CPC title
using braking valves to maintain a back pressure · CPC title
with only one servomotor · CPC title
variable capacity · CPC title
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Frequently asked questions
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- What does patent US10184228B2 cover?
- To keep operability of a hydraulic actuator excellent even in a state pressure has been sufficiently accumulated in a pressure accumulator. In a hydraulic driving device of a work machine including a hydraulic actuator, a tank, a flow control valve, and a pressure accumulator, there are further provided with a first pressure compensation valve that is for controlling difference between front an…
- Who is the assignee on this patent?
- Hitachi Construction Mach Co
- What technology area does this patent fall under?
- Primary CPC classification F15B11/04. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 22 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).