公开(公告)号：US07077481B2

公开(公告)日：2006-07-18

申请号：US10646349

申请日：2003-08-22

申请人： Andrew Marsh ,  John Kemer ,  Charles Eberling ,  Dave Knight ,  Richard T. Ross

发明人： Andrew Marsh ,  John Kemer ,  Charles Eberling ,  Dave Knight ,  Richard T. Ross

IPC分类号： B60T15/02

CPC分类号： B60T15/20 ,  B60T13/261 ,  Y10T137/2278 ,  Y10T137/2544 ,  Y10T137/7845 ,  Y10T137/86919

摘要： A combined spring brake modulating relay valve integrates the functions of a relay valve and a modulating valve. The housing includes a valve assembly movable in response to air pressure provided to selected ports in the housing. A relay piston selectively communicates with a control port and a primary brake circuit port. A modulating piston includes surfaces selectively pressurized by the primary brake circuit port and a secondary brake circuit port. This modulates the pressure from the delivery port to thereby selectively apply the associated spring brakes if a failure is detected at the primary brake circuit port. The exhaust member selectively controls communication between the supply and delivery ports as necessary.

公开(公告)号：US06769744B2

公开(公告)日：2004-08-03

申请号：US09579086

申请日：2000-05-25

申请人： Andrew Marsh ,  John Kemer ,  Charles Eberling ,  Dave Knight ,  Richard T. Ross

发明人： Andrew Marsh ,  John Kemer ,  Charles Eberling ,  Dave Knight ,  Richard T. Ross

IPC分类号： B60T1300

CPC分类号： B60T15/20 ,  B60T13/261 ,  Y10T137/2278 ,  Y10T137/2544 ,  Y10T137/7845 ,  Y10T137/86919

摘要： A combined spring brake modulating relay valve integrates the functions of a relay valve and a modulating valve. The housing includes a valve assembly movable in response to air pressure provided to selected ports in the housing. A relay piston selectively communicates with a control port and a primary brake circuit port. A modulating piston includes surfaces selectively pressurized by the primary brake circuit port and a secondary brake circuit port. This modulates the pressure from the delivery port to thereby selectively apply the associated spring brakes if a failure is detected at the primary brake circuit port. The exhaust member selectively controls communication between the supply and delivery ports as necessary.