公开(公告)号：EP1140544B1

公开(公告)日：2002-07-24

申请号：EP99973400.7

申请日：1999-11-22

申请人： Land Rover Group Limited

发明人： SPOONER, John ,  TICKLE, David, John

IPC分类号： B60K17/346 ,  B60K17/35 ,  F16H48/20 ,  F16D47/06 ,  F16D35/00

CPC分类号： F16D35/005 ,  B60K17/20 ,  B60K17/3465 ,  B60K17/351 ,  B60K23/0808

摘要： In a motor vehicle transmission a first rotary member (43) is connected to a second rotary member (47) by a variable resistance coupling (40). The variable resistance coupling (40) comprises a first viscous coupling (45) connected in series with a second viscous coupling (48) by a common outer housing (49). A selector clutch (50) can connect the outer housing (49) to the second rotary member (47) to render the second viscous coupling (48) ineffective and give a high resistance mode for the variable resistance coupling compared to the low resistance mode when both viscous couplings are operational. The variable resistance coupling (40) is used to control the centre differential (17) in a four wheel drive vehicle. In an alternative arrangement (fig.3, not shown) the variable resistance coupling is in the drive from an intermediate reduction drive driven by a conventional front wheel drive engine and transaxle and connects the transaxle to the rear wheels.

公开(公告)号：EP1140544A1

公开(公告)日：2001-10-10

申请号：EP99973400.7

申请日：1999-11-22

申请人： Land Rover Group Limited

发明人： SPOONER, John ,  TICKLE, David, John

IPC分类号： B60K17/346 ,  B60K17/35 ,  F16H48/20 ,  F16D47/06 ,  F16D35/00

CPC分类号： F16D35/005 ,  B60K17/20 ,  B60K17/3465 ,  B60K17/351 ,  B60K23/0808

摘要： In a motor vehicle transmission a first rotary member (43) is connected to a second rotary member (47) by a variable resistance coupling (40). The variable resistance coupling (40) comprises a first viscous coupling (45) connected in series with a second viscous coupling (48) by a common outer housing (49). A selector clutch (50) can connect the outer housing (49) to the second rotary member (47) to render the second viscous coupling (48) ineffective and give a high resistance mode for the variable resistance coupling compared to the low resistance mode when both viscous couplings are operational. The variable resistance coupling (40) is used to control the centre differential (17) in a four wheel drive vehicle. In an alternative arrangement (fig.3, not shown) the variable resistance coupling is in the drive from an intermediate reduction drive driven by a conventional front wheel drive engine and transaxle and connects the transaxle to the rear wheels.

公开(公告)号：EP0984870B1

公开(公告)日：2001-10-04

申请号：EP98925794.4

申请日：1998-06-04

申请人： Land Rover Group Limited

发明人： SPOONER, John

IPC分类号： B60K17/35 ,  B60K17/346

CPC分类号： B60K17/351 ,  B60K17/3465

摘要： A motor vehicle transmission has a differential assembly (17) in which one input, sun gear (39), of an epicyclic gear train can be selectively coupled by a sleeve (59) through a viscous coupling (55) to either an input, i.e. annulus gear (31), or to another output, i.e. carrier (36). Coupling the sun gear to the annulus gear gives a low resistance mode of operation and coupling the sun gear to the carrier gives a high resistance mode of operation. A locked mode where the annulus is locked to the sun gear is also described, together with a free mode where the viscous coupling is disconnected from both the annulus gear and the carrier. The sleeve is linked to the control of a range change gearbox to select the low resistance mode when a high range is selected for on-road use and a high resistance mode is selected when a low range is selected for off-road use.