Pilot control mechanism for boom bounce reduction

Patent metadata

Field	Value
Publication number	US-2016298660-A1
Application number	US-201415036756-A
Country	US
Kind code	A1
Filing date	Nov 7, 2014
Priority date	Nov 14, 2013
Publication date	Oct 13, 2016
Grant date	—

Abstract

A hydraulic system ( 600 ) and method for reducing boom dynamics of a boom ( 30 ), while providing counter-balance valve protection, includes a hydraulic actuator ( 110 ), first and second counter-balance valves ( 300, 400 ), first and second control valves ( 700, 800 ), and first and second blocking valves ( 350, 450 ). A net load ( 90 ) is supported by a first chamber ( 116, 118 ) of the hydraulic actuator, and a second chamber ( 118, 116 ) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response ( 950 ) that counters environmental vibrations ( 960 ) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

First claim

What is claimed is:

1 . A hydraulic system comprising:
a hydraulic actuator including a first chamber and a second chamber; a first counter-balance valve fluidly connected to the first chamber at a first node; a second counter-balance valve fluidly connected to the second chamber at a second node; a first control valve fluidly connected to the first counter-balance valve at a third node; a second control valve fluidly connected to the second counter-balance valve at a fourth node; and a first valve fluidly connected to a pilot of the first counter-balance valve at a fifth node and fluidly connected to the second counter-balance valve and the second control valve at the fourth node.

2 . The hydraulic system of claim 1 , further comprising a second valve fluidly connected to a pilot of the second counter-balance valve at a sixth node and fluidly connected to the first counter-balance valve and the first control valve at the third node.

3 . The hydraulic system of claim 1 , wherein the first chamber is a rod chamber and the second chamber is a head chamber.

4 . The hydraulic system of claim 1 , wherein the first chamber is a head chamber and the second chamber is a rod chamber.

5 . The hydraulic system of claim 1 , wherein the first counter-balance valve am second counter-balance valve are physically mounted to the hydraulic actuator.

6 . The hydraulic system of claim 1 , wherein the first valve includes a first configuration and a second configuration, wherein the first configuration allows fluid flow between the fourth node and the fifth node, and wherein the second configuration blocks fluid flow from the fourth node to the fifth node and allows fluid flow from the fifth node to the fourth node.

7 . The hydraulic system of claim 6 , wherein the first valve is a two-way valve including a first passage allowing bi-directional flow between the fourth node and the fifth node when the two-way valve is at the first configuration and further including a second passage with a check valve allowing flow from the fifth node to the fourth node and preventing flow from the fourth node to the fifth node when the two-way valve is at the second configuration.

8 . The hydraulic system of claim 2 , wherein the first valve includes a first configuration and a second configuration, wherein the first configuration allows fluid flow between the fourth node and the fifth node, wherein the second configuration blocks fluid flow from the fourth node to the fifth node and allows fluid flow from the fifth node to the fourth node, wherein the second valve includes a third configuration and a fourth configuration, wherein the third configuration allows fluid flow between the third node and the sixth node, and wherein the fourth configuration blocks fluid flow from the third node to the sixth node and allows fluid flow from the sixth node to the third node.

9 . The hydraulic system of claim 1 , wherein the hydraulic system is adapted to support a net load with the first chamber of the hydraulic actuator and wherein the hydraulic system is further adapted to produce a vibratory response by transmitting a fluctuating pressure to the second chamber of the hydraulic actuator.

10 . The hydraulic system of claim 9 , wherein the first counter-balance valve blocks fluid flow from the first chamber of the hydraulic actuator and thereby supports the net load when vibration control is active, wherein the first control valve opens bi-directional flow through the second counter-balance valve by pressurizing a pilot of the second counter-balance valve when the vibration control is active wherein the second counter-balance valve transfers the fluctuating pressure between the second control valve and the second chamber of the hydraulic actuator when the vibration control is active, and wherein the first valve blocks the fluctuating pressure from the pilot of the first counter-balance valve and thereby prevents opening of the first counter-balance valve when the vibration control is active.

11 . The hydraulic system of claim 10 , wherein the hydraulic system is adapted to drain the fifth node of leakage from the pilot of the first counter-balance valve and thereby prevent pilot pressure at the fifth node from exceeding an opening pressure and opening the first counter-balance valve when the vibration control is active.

12 . The hydraulic system of claim 11 , wherein a check valve of the first valve is adapted to drain the leakage from the fifth node at least when the fluctuating pressure is below a low pressure and wherein the check valve blocks fluid flow from the fourth node to the fifth node when the vibration control is active,

13 . The hydraulic system of claim 1 , wherein when vibration control is not active, the first counter-balance valve and the second counter-balance valve are adapted to provide the hydraulic actuator with conventional counter-balance valve protection.

14 . The hydraulic system of claim 1 , wherein the second control valve includes a pressure sensor adapted to measure a vibration load applied to the hydraulic actuator.

15 . The hydraulic system of claim 1 wherein the hydraulic actuator is a linear hydraulic actuator.

16 . The hydraulic system of claim 1 , wherein the hydraulic actuator is a hydraulic cylinder.

17 . The hydraulic system of claim 1 , wherein the hydraulic actuator is a rotary hydraulic actuator.

18 . A hydraulic system for actuating a boom, the hydraulic system comprising:
a hydraulic actuator including a first chamber and a second chamber; a first control valve fluidly connected to the first chamber via a first counter-balance valve; and a second control valve fluidly connected to the second chamber via a second counter-balance valve; wherein the first chamber of the hydraulic actuator is adapted to support a net load when vibration control is active; and wherein the second chamber of the hydraulic actuator is adapted to produce a vibratory response when the vibration control is active.

19 . The hydraulic system of claim 18 , further comprising e adapted to allow the second control valve to pressurize a pilot of the first counter-balance valve when the vibration control is not active and further adapted to prevent the second control valve from pressurizing the pilot of the first counter-balance valve when the vibration control is active.

20 . The hydraulic system of claim 18 , wherein the first counter-balance valve is adapted to hold a holding pressure of the first chamber and thereby support the net load and wherein the second control valve is adapted to transmit a fluctuating pressure to the second chamber and thereby cause the hydraulic actuator to produce the vibratory response.

21 . A hydraulic valve set comprising:
a first counter-balance valve adapted to prevent fluid flow from exiting a hydraulic component through a first node unless a first opening pressure is applied to a first pilot of the first counter-balance valve; a second counter-balance valve adapted to prevent fluid flow from exiting the hydraulic component through a second node unless a second opening pressure is applied to a second pilot of the second counter-balance valve; a third node fluidly connected to the first counter-balance valve; a fourth node fluidly connected to the second counter-balance valve; and a first valve fluidly connected to the first pilot of the first counter-balance valve at a fifth node and fluidly connected to the second counter-balance valve at the fourth n

Assignees

• Eaton Corp

Inventors

• Wang Meng (Rachel)
• Rannow Michael Berne

Classifications

• F15B11/0445

  with counterbalance valves, e.g. to prevent overrunning or for braking · CPC title

• E04G21/0436

  on a mobile support, e.g. truck · CPC title

• F15B2211/5059

  using double counterbalance valves · CPC title

• F15B21/008 Primary

  Reduction of noise or vibration · CPC title

• F15B2211/3057

  having two valves, one for each port of a double-acting output member · CPC title