US 12,467,532 B2
Crane having a closed hydraulic circuit
Thomas Jaenicke, Wiefelstede (DE); Verena Bohmann, Oldenburg (DE); and Alexander Suntay, Friedeburg (DE)
Assigned to Manitowoc Crane Group France SAS, Dardilly (FR)
Appl. No. 16/633,946
Filed by Manitowoc Crane Group France SAS, Dardilly (FR)
PCT Filed Jun. 8, 2018, PCT No. PCT/EP2018/065110
§ 371(c)(1), (2) Date Jan. 24, 2020,
PCT Pub. No. WO2019/025058, PCT Pub. Date Feb. 7, 2019.
Claims priority of application No. 10 2017 117 505.9 (DE), filed on Aug. 2, 2017.
Prior Publication US 2020/0207589 A1, Jul. 2, 2020
Int. Cl. F16H 61/4043 (2010.01); B66C 23/00 (2006.01); F15B 21/047 (2019.01); F16H 61/4061 (2010.01); F16H 61/4157 (2010.01); F16H 61/4183 (2010.01); F15B 11/04 (2006.01)
CPC F16H 61/4043 (2013.01) [B66C 23/54 (2013.01); F15B 21/047 (2013.01); F16H 61/4157 (2013.01); F16H 61/4183 (2013.01); F15B 11/0406 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/415 (2013.01); F16H 61/4061 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A crane having a closed hydraulic circuit in which a hydraulic pump is hydraulically connected to at least one hydraulic motor via a feed and a discharge to provide fluid flow delivered to the at least one hydraulic motor, and in which the feed is hydraulically connected to the discharge via at least one bypass which bypasses the at least one hydraulic motor, wherein the at least one bypass comprises a continuously adjustable proportional valve, which is adapted to be proportionally opened and closed so as to variably control a fluid flow in the at least one bypass the continuously adjustable proportional valve being operatively coupled to an operator control member, and
a control device which is in contact with the hydraulic pump and the at least one continuously adjustable proportional valve via at least one interface and is configured to actuate the hydraulic pump and the at least one continuously adjustable proportional valve during crane operations in a co-ordinated way,
wherein the control device is configured to initiate:
an acceleration of the at least one hydraulic motor by actuating the hydraulic pump to provide the fluid flow delivered to the hydraulic motor at a pressure that is higher than a pressure of a fluid flow received at the hydraulic pump from the at least one hydraulic motor;
a coasting state of the at least one hydraulic motor by actuating the at least one continuously adjustable proportional valve to open, and by actuating the hydraulic pump to reduce the fluid flow delivered to the hydraulic motor, wherein a fluid flow delivered from the at least one hydraulic motor is directed through the at least one bypass; and
deceleration initiated by a valve-controlled deceleration of the at least one hydraulic motor in the coasting state by actuating the at least one continuously adjustable proportional valve to proportionally close, wherein the continuously adjustable proportional valve is directly controlled by the operator control member to cause deceleration by causing a fluid flow received at the hydraulic motor from the at least one continuously adjustable proportional valve to be maintained at a lower pressure than the fluid flow delivered from the at least one hydraulic motor to the at least one continuously adjustable proportional valve.