Selectively operated gerotor device

In a device using a pressure differential between expanding and contracting working chambers to rotate a shaft, the improvement of equalization means within the body of the device to equalize the pressure between the working chambers, and said equalization means having a capacity to selectively bypass part of the pressurized fluid in respect to the working chambers to the unpressurized return to reduce the volume of fluid operating the working chambers.

In a device using a pressure differential between expanding and contracting working chambers to rotate a shaft, the device having a fixed body, the improvement of equalization means within the body of the device to equalize the pressure between the working chambers, said equalization means including holes in the fixed body of the device leading from the working chambers directly to a fluid bypass chamber, with flow of fluid through said holes equalizing the pressure between the working chambers, and said equalization means preventing the flow of fluid through said holes in the engaged condition of the device.

In a device utilizing a pressure differential between expanding and contracting working chambers to rotate a shaft, the working chambers having a fixed plate adjoining such working chambers, the device having multiple passages leading to the working chambers with a certain flow capacity for the volume of fluid passing into the working chambers therethrough, the improvement of an equalization means within the body of the device, said equalization means including a fluid bypass chamber, means to selectively connect said equalization means to the multiple passages of the device to interconnect such multiple passages, said equalization means having flow capacity capability for allowing the passage of a volume of fluid between such multiple passages greater than the certain flow capacity limit for the multiple passages of the device, said equalization means including holes extending through the fixed plate adjoining the working chambers directly to said fluid bypass chamber, with flow of fluid through said holes equalizing the pressure between the working chambers, and said equalization means preventing the flow of fluid through said holes in the engaged condition of the device.

In a device utilizing a pressure differential between expanding and contracting working chambers to rotate a shaft, the device having multiple passages leading to the working chambers with a certain flow capacity for the volume of fluid passing into the working chambers therethrough, the improvement of an equalization means within the body of the device, means to selectively connect said equalization means to the multiple passages of the device to interconnect such multiple passages, said equalization means having flow capacity capability for allowing the passage of a volume of fluid between such multiple passages greater than the certain flow capacity limit of the multiple passages of the device, and said means to selectively connect said equalization means to the multiple passages of the device including the working chambers of the device.

In a device utilizing a pressure differential between expanding and contracting working chambers to rotate a shaft, the device having a fixed body, the device having multiple passages leading to the working chambers with a certain flow capacity on the volume of fluid passing into the working chambers therethrough, the improvement of an equalization means within the body of the device, means to selectively connect said equalization means to the multiple passages of the device to interconnect such multiple passages, said equalization means having flow capacity capability of allowing the passage of a volume of fluid between such multiple passages greater than the certain flow capacity limit of the multiple passages of the device, said equalization means including holes in the fixed body of the device leading from the working chambers directly to a fluid bypass chamber, with flow of fluid through said holes equalizing the pressure between the working chambers, and said equalization means preventing the flow of fluid through said holes in the engaged condition of the device.

In a device utilizing a pressure differential between expanding and contracting working chambers to rotate a shaft, the device having a body, the device having multiple passages leading to the working chambers with a certain flow capacity on the volume of fluid passing into the working chambers therethrough, the improvement of an equalization means within the body of the device, means to selectively connect said equalization means to the multiple passages of the device to interconnect such multiple passages, said equalization means having flow capacity capability of allowing the passage of a volume of fluid between such multiple passages greater than the certain flow capacity limit of the multiple passages of the device, said equalization means including holes in the body of the device leading from the working chambers to a fluid bypass chamber, and said equalization means including a valve member to close off said holes.

In a device utilizing a pressure differential between working chambers to rotate a shaft, the device having multiple passages leading to the working chambers with a certain limit on the volume of fluid passing into the working chambers therethrough, the improvement of an equalization means within the body of the device, means to selectively connect said equalization means to the multiple passages of the device to interconnect such passages, said equalization means having capability of allowing passage of a volume of fluid between such passages greater than the certain limit of the multiple passages of the device, and said equalization means has a variable capacity to selectively bypass part of the pressurized fluid in respect to the working chambers to the unpressurized return to reduce the volume of fluid operating the working chambers, with flow of fluid through said holes equalizing the pressure between the working chambers, and said equalization means preventing the flow of fluid through said holes in the engaged condition of the device.

In a device utilizing a pressure differential between expanding and contracting working chambers to rotate a shaft, the device having multiple passages having a limited volume flow capacity leading to the working chambers, the improvement of a cavity in the body of the device, a piston, said piston being located in said cavity dividing such cavity into two chambers, holes, said holes connecting one chamber of said cavity to the working chambers, said holes and said cavity having a flow capacity of allowing a passage of fluid between the working chambers greater than the limited volume flow capacity of the multiple passages of the device, and means to selectively move said piston in said cavity between open and closed positions with the pressure being equalized between working chambers through said holes and cavity to disengage the shaft rotation in said open position of said piston and the pressure in the working chambers being substantially unaffected in said closed position of said piston.

In a device utilizing a pressure differential between expanding and contracting working chambers to rotate a shaft, the device having multiple passages having a limited volume flow capacity leading to the working chambers, the improvement of a bypass channel in the body of the device, a valve member, said valve member being located in said bypass channel dividing such channel into two chambers, holes, said holes connecting one chamber of said bypass channel to the working chambers, said holes and said bypass channel being capable of allowing a flow passage of fluid between the working chambers greater than the limited volume flow capacity of the multiple passages of the device, and valving means to connect the other chamber of said bypass channel to a source of pressure to selectively move said valve member in said bypass channel between open and closed positions with the pressure being equalized between working chambers through said holes and bypass channel to disengage the shaft rotation in said open position of said valve member and the pressure in the working chambers being substantially unaffected in said closed position of said valve member.

In a device utilizing a pressure differential between expanding and contracting working chambers to rotate a shaft, the device having multiple passages having a limited volume flow capacity leading to the working chambers, the improvement of a cavity in the body of the device, a disk piston, said disk piston being located in said cavity dividing such cavity into two chambers, holes, said holes connecting one chamber of said cavity to the working chambers, said holes and said cavity being capable of allowing a flow passage of fluid between the working chambers greater than the limited volume flow capacity of the multiple passages of the device, and valving means to connect the other chamber of said cavity to a source of pressure to selectively move said disk piston in said cavity between open and closed positions with the pressure being equalized between working chambers through said holes and cavity to disengage the shaft rotation in said open position of said disk piston and the pressure in the working chambers being substantially unaffected in said closed position of said disk piston.