Hydraulic pump control system of hydraulic working machine
US-2018238027-A1 · Aug 23, 2018 · US
Apparatus for controlling raise speed of working machine for heavy equipment
US8997477B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8997477-B2 |
| Application number | US-201113698432-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 19, 2011 |
| Priority date | May 19, 2010 |
| Publication date | Apr 7, 2015 |
| Grant date | Apr 7, 2015 |
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Abstract
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The present disclosure relates to an apparatus for controlling a raise speed of a working machine for heavy equipment that includes first and second pumps, a main control valve unit that includes two lift cylinder operation units connected with the first and second pumps and operating two lift cylinders and one tilt cylinder operation unit operating two tilt cylinders, a priority valve that is provided in a working fluid line between the second pump and the main control valve unit, and a lift lever that includes a remote control valve connected with the two lift cylinder operation units through a pilot oil line, respectively, and controlling the two lift cylinders through the two lift cylinder operation units, in which a valve control unit, which electrically controls the flow of pilot oil in proportion to the RPM of an engine to allow or stop the working fluid flowing from any one of the two lift cylinder operation units to the two lift cylinders, is disposed in any one of two pilot oil lines between the two lift cylinder operation units and the remote control valve of the lift lever.
First claim
Opening claim text (preview).
The invention claimed is: 1. An apparatus for controlling a raise speed of a working machine for heavy equipment that includes: first and second pumps; a main control valve unit that includes two lift cylinder operation units connected with the first and second pumps and operating two lift cylinders and one tilt cylinder operation unit operating two tilt cylinders; a priority valve that is provided in a working fluid line between the second pump and the main control valve unit…
Assignees
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Mechanical Engineering · mapped topic
- F15B11/166Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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Frequently asked questions
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- What does patent US8997477B2 cover?
- The present disclosure relates to an apparatus for controlling a raise speed of a working machine for heavy equipment that includes first and second pumps, a main control valve unit that includes two lift cylinder operation units connected with the first and second pumps and operating two lift cylinders and one tilt cylinder operation unit operating two tilt cylinders, a priority valve that is …
- Who is the assignee on this patent?
- Heo Chan, Koh Hyun Gie, Doosan Corp
- What technology area does this patent fall under?
- Primary CPC classification F15B11/166. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Apr 07 2015 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).