公开(公告)号：EP1550594B1

公开(公告)日：2008-01-23

申请号：EP04028677.5

申请日：2004-12-03

申请人： JCB TRANSMISSIONS

发明人： Sturgess, Peter

IPC分类号： B60T15/58 ,  B60T15/40 ,  E02F1/00 ,  B60T11/224

CPC分类号： B60T15/40 ,  B60T11/224 ,  B60T15/38

公开(公告)号：EP1550594A1

公开(公告)日：2005-07-06

申请号：EP04028677.5

申请日：2004-12-03

申请人： JCB TRANSMISSIONS

发明人： Sturgess, Peter

IPC分类号： B60T15/58 ,  B60T15/40 ,  E02F1/00 ,  B60T11/224

CPC分类号： B60T15/40 ,  B60T11/224 ,  B60T15/38

摘要： A braking system 20 including a brake actuator 32 which is moveable by pressurised hydraulic fluid in a first direction A, against a restoring force, to move a brake applying member 27 to apply a braking force to a member 26 to be braked, a master valve 22, including a piston assembly 40 which upon operation of a brake operating member 18, directs the hydraulic fluid under pressure to the brake actuator 32 to apply the brake, the system 20 further including a source of pressurised hydraulic fluid 71, 75, and a charging valve 70 which is operable in first and second states, the piston assembly 40 of the master valve including a pair of coupled pistons 41, 44, and a chamber 55 between the pair of pistons 41, 44, the charging valve 70 when operated in a first state communicating the source of pressurised hydraulic fluid 71, 75 to the chamber 55 between the pair of pistons 41, 44 of the master valve 22, the coupling of the pistons 41, 44 permitting the pistons 41, 44 of the pair to move apart in response, up to a maximum distance thereby to direct up to a predetermined volume of hydraulic fluid to the brake actuator 32, to move the brake applying member 27 in the first direction A towards the member to be braked 26 to reduce a running clearance between them, and the charging valve 70 when operated in the second state, communicating the chamber 55 to a lower pressure area 63 to allow the pair of pistons 41, 44 to be moved towards one another, and thus to permit the brake actuator 32 to move in a second direction opposite to the first direction A to increase the running clearance between the brake applying member 27 and the member 26 to be braked.

摘要翻译： 制动系统20包括制动器致动器32，该制动器致动器32可通过加压液压流体在第一方向A上抵抗回复力移动，以移动制动施加构件27以向要制动的构件26施加制动力;主阀 如图22所示，包括活塞组件40，其在制动操作构件18的操作时将压力下的液压流体引导到制动致动器32以施加制动器，系统20还包括加压液压流体源71,75的源和 充气阀70可在第一和第二状态下操作，主阀的活塞组件40包括一对联接的活塞41,44和位于一对活塞41,44之间的腔室55，充气阀70在操作时 将加压液压流体源71,75的源连接到主阀22的一对活塞41,44之间的腔室55的第一状态，活塞41,44的联接器允许该对的活塞41,44移动 美联社 直到达到最大距离，从而将达到制动致动器32的预定体积的液压流体引导到第一方向A上的制动施加构件27朝向要制动的构件26移动以减小行驶间隙 在它们之间和充电阀70在第二状态下操作时，将室55连通到较低压力区域63，以允许一对活塞41,44彼此移动，从而允许制动致动器32 在与第一方向A相反的第二方向上移动，以增加制动施加构件27和要制动的构件26之间的行驶间隙。