公开(公告)号：US10801612B1

公开(公告)日：2020-10-13

申请号：US16396219

申请日：2019-04-26

Applicant: Caterpillar Inc.

Inventor： Brian E. Lister ,  Gaurav Vasudeva ,  Konrad Garrett ,  Aaron B. Crabtree ,  Michael Beyer

IPC: F16H61/12 ,  F16H61/00 ,  F16H45/00

Abstract: A transmission for a machine is disclosed. The transmission may comprise a torque path providing a path for transmission of torque from an input shaft to an output shaft, and a single clutch element along the torque path. The transmission may further comprise a clutch actuator configured to actuate engagement of the clutch element, and a clutch pressure control (CPC) valve configured to permit a flow of hydraulic fluid to the clutch actuator through a control pressure line when in an open position to cause the clutch actuator to actuate engagement of the clutch element. The transmission may further comprise a failure mode response (FMR) valve in the control pressure line between the CPC valve and the clutch actuator. The FMR valve may have a failure position obstructing flow of the hydraulic fluid from the CPC valve to the clutch actuator when the CPC valve is in the open position.

公开(公告)号：US11920677B2

公开(公告)日：2024-03-05

申请号：US17590273

申请日：2022-02-01

Applicant: Caterpillar Inc.

Inventor： Christopher W. Pruess ,  Aaron B. Crabtree ,  Jeremiah C Johnson

IPC: F16H61/4104 ,  F16H57/04 ,  F16H61/4139 ,  F16H61/4165

CPC classification number: F16H61/4104 ,  F16H57/0408 ,  F16H57/0412 ,  F16H61/4139 ,  F16H61/4165

Abstract: A system including a gearbox and a hydraulic machine connected by a working fluid circuit. The gearbox including a gearbox housing having first and second gearbox fluid passages integrated into the gearbox housing. The hydraulic machine including a case having first and second hydraulic machine fluid passages, the first and second hydraulic machine fluid passages being integrated into the case. A set of rotating elements enclosed within the case. The first gearbox fluid passage and the first hydraulic machine fluid passage align to form a feed passage to conduct fluid at a first pressure from a first source to the set of rotating elements. The second gearbox fluid passage and the second hydraulic machine fluid passage align to form a charge passage to conduct fluid at a second pressure from a second source to the set of rotating elements. The first pressure being less than the second pressure.

公开(公告)号：US20200340577A1

公开(公告)日：2020-10-29

申请号：US16396219

申请日：2019-04-26

Applicant: Caterpillar Inc.

Inventor： Brian E. Lister ,  Gaurav Vasudeva ,  Konrad Garrett ,  Aaron B. Crabtree ,  Michael Beyer

IPC: F16H61/12 ,  F16H61/00

Abstract: A transmission for a machine is disclosed. The transmission may comprise a torque path providing a path for transmission of torque from an input shaft to an output shaft, and a single clutch element along the torque path. The transmission may further comprise a clutch actuator configured to actuate engagement of the clutch element, and a clutch pressure control (CPC) valve configured to permit a flow of hydraulic fluid to the clutch actuator through a control pressure line when in an open position to cause the clutch actuator to actuate engagement of the clutch element. The transmission may further comprise a failure mode response (FMR) valve in the control pressure line between the CPC valve and the clutch actuator. The FMR valve may have a failure position obstructing flow of the hydraulic fluid from the CPC valve to the clutch actuator when the CPC valve is in the open position.