Abstract: The problem of aligning the drive shaft of a pressure clamped pump with the output shaft of a drive motor in a hydraulic apparatus is solved through the use of pressure clamped pump having a housing adapted for installation into a cavity and a drive shaft coincident with the center of the housing. The hydraulic apparatus may include piloting features configured to facilitate alignment of the pump drive shaft with the output shaft of a motor used to drive the pump. The pump may include elements for retaining the drive shaft within the pump, and may also include a larger and less restricted inlet than could be achieved in prior pressure clamped pumps. The pump may include pumping means in the form of a gear pump having a single primary gear driving a single secondary gear. The pumping means may alternatively be a gear pump having a single primary gear driving two or more secondary gears.

Abstract: The problem of aligning the drive shaft of a pressure clamped pump with the output shaft of a drive motor in a hydraulic apparatus is solved through the use of pressure clamped pump having a housing adapted for installation into a cavity and a drive shaft coincident with the center of the housing. The hydraulic apparatus may include piloting features configured to facilitate alignment of the pump drive shaft with the output shaft of a motor used to drive the pump. The pump may include elements for retaining the drive shaft within the pump, and may also include a larger and less restricted inlet than could be achieved in prior pressure clamped pumps. The pump may include pumping means in the form of a gear pump having a single primary gear driving a single secondary gear. The pumping means may alternatively be a gear pump having a single primary gear driving two or more secondary gears.

Abstract: A pump assembly comprises a hydraulic fluid pump having a housing assembled from a plurality of housing components that are pinned together rather than being clamped together by bolts. The pump is disposed in a cavity in a valve block so that the outlet fluid pressure from the pump is applied axially to the housing components to create a greater external axial force on the pump components than the internal axial force and thereby maintain the housing components in tight, sealing relation without the need for clamping bolts or other clamping means.

Abstract: A motor-driven alternator including an improved remote on/off switch closure detection system capable of detecting closure of solid-state switches. Such switches are typical of appliances, tools, or other electrical load devices. A sensing signal is provided by a higher voltage ac or pulsating dc signal for overcoming the forward breakdown voltage of semi-conductors typical of such switches. A detection circuit is included which comprises an opto-isolator circuit for isolation of the power and sensing circuits.