公开(公告)号：EP1085241A3

公开(公告)日：2003-01-29

申请号：EP00114549.9

申请日：2000-07-06

申请人： General Motors Corporation

发明人： Vahabzadeh, Hamid ,  Bucknor, Norma K.

IPC分类号： F16H61/00

CPC分类号： F16H61/66259 ,  F16H61/66272 ,  F16H2061/66286

摘要： A continuously variable transmission (CVT) has a drive sheave (30) and a driven sheave (36), each of which has an adjustable portion (32,38), that is positioned by hydraulic control piston (28,34). The pistons (28,34) are pressurized from a control system to properly position each adjustable portion (32,38), such that a flexible drive member (40), trained over the sheaves (30,36), operates at the required diameter to establish the desired speed ratio between the drive sheave (30) and the driven sheave (36). The control has two variable displacement pump assemblies (10,26) that supply hydraulic fluid at the required pressure to maintain the desired ratio and to effect a ratio change as required by the operating conditions. One of the pumps (10) supplies a primary pressure which is proportional to the torque requirement of the CVT and the other pump (26) supplies the necessary pressure bias to effect the ratio change. The ratio control pump (26) is variable to both sides of a neutral condition such that the ratio control fluid can be delivered to either adjustable portion (32,38) while the primary pump (10) maintains the required torque capacity pressure in the system.

公开(公告)号：EP1085241A2

公开(公告)日：2001-03-21

申请号：EP00114549.9

申请日：2000-07-06

申请人： General Motors Corporation

发明人： Vahabzadeh, Hamid ,  Bucknor, Norma K.

IPC分类号： F16H61/00

CPC分类号： F16H61/66259 ,  F16H61/66272 ,  F16H2061/66286

摘要： A continuously variable transmission (CVT) has a drive sheave (30) and a driven sheave (36), each of which has an adjustable portion (32,38), that is positioned by hydraulic control piston (28,34). The pistons (28,34) are pressurized from a control system to properly position each adjustable portion (32,38), such that a flexible drive member (40), trained over the sheaves (30,36), operates at the required diameter to establish the desired speed ratio between the drive sheave (30) and the driven sheave (36). The control has two variable displacement pump assemblies (10,26) that supply hydraulic fluid at the required pressure to maintain the desired ratio and to effect a ratio change as required by the operating conditions. One of the pumps (10) supplies a primary pressure which is proportional to the torque requirement of the CVT and the other pump (26) supplies the necessary pressure bias to effect the ratio change. The ratio control pump (26) is variable to both sides of a neutral condition such that the ratio control fluid can be delivered to either adjustable portion (32,38) while the primary pump (10) maintains the required torque capacity pressure in the system.

摘要翻译： 无级变速器（CVT）具有驱动滑轮（30）和驱动滑轮（36），每个驱动滑轮具有由液压控制活塞（28,34）定位的可调部分（32,38）。 活塞（28,34）从控制系统被加压以适当地定位每个可调整部分（32,38），使得在滑轮（30,36）上训练的柔性驱动构件（40）在所需直径 以建立驱动绳轮（30）和驱动绳轮（36）之间的期望的速比。 该控制器具有两个可变排量泵组件（10,26），其将所需压力的液压流体供应以维持所需的比率并且根据操作条件来实现比率变化。 一个泵（10）提供与CVT的扭矩要求成比例的一次压力，另一个泵（26）提供必要的压力偏压来实现比率变化。 比例控制泵（26）可以变为中性状态的两侧，使得比例控制流体可以被输送到任一个可调节部分（32,38），同时主泵（10）保持系统中所需的扭矩容量压力 。