US 9,810,242 B2
Hydraulic system and method for reducing boom bounce with counter-balance protection
Meng (Rachel) Wang, Eden Prairie, MN (US)
Assigned to Eaton Corporation, Cleveland, OH (US)
Appl. No. 14/894,662
Filed by Meng (Rachel) Wang, Eden Prairie, MN (US)
PCT Filed May 13, 2014, PCT No. PCT/US2014/037879
§ 371(c)(1), (2) Date Nov. 30, 2015,
PCT Pub. No. WO2014/193649, PCT Pub. Date Dec. 4, 2014.
Claims priority of provisional application 61/829,796, filed on May 31, 2013.
Prior Publication US 2016/0108936 A1, Apr. 21, 2016
Int. Cl. F15B 11/00 (2006.01); E02F 9/22 (2006.01); B66C 13/06 (2006.01); E04G 21/04 (2006.01); F15B 21/00 (2006.01); F15B 11/044 (2006.01)
CPC F15B 11/003 (2013.01) [B66C 13/066 (2013.01); E02F 9/2207 (2013.01); E04G 21/0454 (2013.01); F15B 11/0445 (2013.01); F15B 21/008 (2013.01); F15B 2211/3057 (2013.01); F15B 2211/30515 (2013.01); F15B 2211/329 (2013.01); F15B 2211/5059 (2013.01); F15B 2211/526 (2013.01); F15B 2211/6313 (2013.01); F15B 2211/6658 (2013.01); F15B 2211/8616 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A hydraulic system comprising:
a hydraulic cylinder 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 selection valve arrangement fluidly connected to the first node and the second node, the selection valve arrangement adapted to self-configure to a first configuration set when a net load is supported by the second chamber of the hydraulic cylinder and further adapted to self-configure to a second configuration set when the net load is supported by the first chamber of the hydraulic cylinder;
wherein when the selection valve arrangement is enabled and at the first configuration set, the first control valve is adapted to fluctuate a first hydraulic fluid flow to the first chamber and thereby cause the hydraulic cylinder to produce a first vibratory response.
 
21. A method of controlling vibration in a boom, the method comprising:
providing a hydraulic actuator including a first chamber and a second chamber;
selecting one of the first chamber and the second chamber as a locked chamber;
selecting another of the first chamber and the second chamber as a dynamically pressurized chamber;
locking the locked chamber; and
transmitting vibrating hydraulic fluid to the dynamically pressurized chamber.