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公开(公告)号：US10344858B2
公开(公告)日：2019-07-09
申请号：US15789007
申请日：2017-10-20
发明人： Scott Joseph Gittins , Matthew Scott Malnar , Allison Lynch , Lisa Waldock , Alexander Phillip McDonnell
IPC分类号： F16H63/34 , F16K11/07 , F16K31/122 , F16K15/00 , F16H3/66
摘要： A park valve includes a slidable end-cap. Under normal circumstances, the end-cap is held in a nominal position by a spring, such as a Belleville spring. The park valve performs a multi-plexing function in which an out-of-park circuit is connected to line pressure when the valve is in an out-of-park position and is vented when the valve is in a park position. In an intermediate position, a hydraulic lock condition may potentially occur. When engaging park, the hydraulic lock condition is prevented by the slidable end-cap.
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公开(公告)号：US10704677B2
公开(公告)日：2020-07-07
申请号：US16004681
申请日：2018-06-11
发明人： Scott Joseph Gittins , Lisa Waldock , Stephen Michael Cicala , Joseph Scott Slayton , Derek Kinch , Timothy Fedullo , Bradley D. Riedle
摘要： A transmission includes an accumulator to hold one of more shift elements in an engaged state while an engine is off. The transmission also includes a hydraulic park system that disengages park in response to engagement of two shift elements. In some circumstance, draining the accumulator in an uncontrolled manner in the presence of a failed valve may lead to unintentionally disengaging park. To avoid this, the accumulator is discharged in a controlled manner. Fluid is first transferred from the accumulator to a shift element apply chamber. Then, the fluid is vented from the shift element apply chamber.
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公开(公告)号：US20190376597A1
公开(公告)日：2019-12-12
申请号：US16004681
申请日：2018-06-11
发明人： Scott Joseph Gittins , Lisa Waldock , Stephen Michael Cicala , Joseph Scott Slayton , Derek Kinch , Timothy Fedullo , Bradley D. Riedle
摘要： A transmission includes an accumulator to hold one of more shift elements in an engaged state while an engine is off. The transmission also includes a hydraulic park system that disengages park in response to engagement of two shift elements. In some circumstance, draining the accumulator in an uncontrolled manner in the presence of a failed valve may lead to unintentionally disengaging park. To avoid this, the accumulator is discharged in a controlled manner. Fluid is first transferred from the accumulator to a shift element apply chamber. Then, the fluid is vented from the shift element apply chamber.
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公开(公告)号：US20190120376A1
公开(公告)日：2019-04-25
申请号：US15789007
申请日：2017-10-20
发明人： Scott Joseph Gittins , Matthew Scott Malnar , Allison Lynch , Lisa Waldock , Alexander Phillip McDonnell
IPC分类号： F16H63/34 , F16K11/07 , F16K31/122
CPC分类号： F16H63/3483 , F16H3/66 , F16H63/3425 , F16H2200/2012 , F16H2200/2046 , F16K11/0704 , F16K15/00 , F16K31/1221
摘要： A park valve includes a slidable end-cap. Under normal circumstances, the end-cap is held in a nominal position by a spring, such as a Belleville spring. The park valve performs a multi-plexing function in which an out-of-park circuit is connected to line pressure when the valve is in an out-of-park position and is vented when the valve is in a park position. In an intermediate position, a hydraulic lock condition may potentially occur. When engaging park, the hydraulic lock condition is prevented by the slidable end-cap.
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