Abstract: The hydrostatic drive with regeneration circuit comprises a geroter flow divider which operates in conjunction with a two position three way valve and a check valve to provide regeneration flow for the hydrostatic drive when the valve is energized.

Abstract: A master cylinder provides separate flow paths through its secondary piston to provide greater fluid flow capacity from the reservoir to both the primary and secondary pressure chambers in response to the removal of brake fluid from the brake lines fed by the primary and secondary pressure chambers by a pump providing brake pressure for activation of one or more wheel brakes independently of the master cylinder. The secondary piston is provided with an axial fluid flow passage having check valves at each axial end permitting fluid flow only out of the axial fluid flow passage into the primary and secondary pressure chambers. A cross flow passage intersects the axial fluid flow passage between the primary and secondary check valves to communicate the axial fluid flow passage with the intermediate chamber and thus with the reservoir through the secondary compensation opening. The additional flow capacity to both pressure chambers provides improved reaction time for a traction control system at any wheel brake.

Abstract: A housing for an axle driving apparatus which is partitioned therein through an inner wall into a first chamber for housing therein a hydrostatic transmission and a second chamber for housing therein a drive train for transmitting power outputted from the hydrostatic transmission to axles. An oil filter is disposed between the first chamber and the second chamber. The first chamber and the second chamber are filled with oil which can flow between the first chamber and the second chamber through an oil filter, whereby the volume of oil, which varies as the temperature of the oil in the first chamber rises or lowers, can be adjusted.

Abstract: A housing for an axle driving apparatus which is partitioned therein through an inner wall into a first chamber for housing therein a hydrostatic transmission and a second chamber for housing therein a drive train for transmitting power outputted from the hydrostatic transmission to axles. An oil filter is disposed between the first chamber and the second chamber. The first chamber and the second chamber are filled with oil which can flow between the first chamber and the second chamber through an oil filter, whereby the volume of oil, which varies as the temperature of the oil in the first chamber rises or lowers, can be adjusted.

Abstract: Apparatus for improving the efficiency of filtering fluid of a hydraulic system, including a venturi adapted for connection to a first fluid carrying conduit of the hydraulic system for receiving a flow of the fluid therefrom, the venturi having a restricted passage extending therethrough and an orifice communicating therewith, a diverter conduit connected in communication with the orifice and with a second fluid carrying conduit of the hydraulic system, the diverter conduit containing a restricted orifice therein, and the venturi having an outlet connected in fluid communication with a filter, wherein the flow of the fluid through the restricted passage of the venturi will generate a reduced pressure condition in the diverter conduit to divert at least some of the fluid in the second fluid carrying conduit of the hydraulic system into the diverter conduit so as to pass into the venturi and flow onto the filter, the reduced pressure condition being weak or strong in correspondence to the fluid flow through th

Abstract: A remotely located brake booster for supplying an input force to a pressurizing device to develop pressurized fluid to effect a brake application. The brake booster responds to an actuation signal in the form of pressurized fluid being communicated from a control apparatus activated by an operator. The brake booster has a housing with a bore and a piston located therein to define an operational chamber. The housing has an inlet port through which pressurized fluid from the control apparatus is receiving by the operational chamber. The piston moves from a rest position to an actuation position in response to pressurized fluid being received in the operational chamber to produce the input force for operating the pressurizing device.

Abstract: A device for selectively controlling the direction of blood flow to and from the patient during hemodialysis comprises two interlocking disks that rotate in relation to each other without separating. The two disks have fluid fittings that allow the blood lines attached to the patient to connect to one of the disks and the blood inlet and outlet for the hemodialysis machine to connect to the other. The center of each fluid fitting is a channel that aligns to a corresponding channel in the other disk. The disks rotate between two fixed relative positions, referred to herein as preferred alignments. The preferred alignments are such that the line drawing blood from the patient in the first preferred alignment becomes the line returning blood to the patient in the second preferred alignment, and the line returning blood to the patient in the first preferred alignment becomes the line drawing blood from the patient in the second preferred alignment.

Abstract: A hydrostatic transmission and a charge pump for supplying operating oil which are housed in a housing, in which a pump casing of the charge pump is mounted to a center section of the hydrostatic transmission without using mounting bolts. A spring is interposed between the pump casing and the inner surface of the housing. For defining pump discharge pressure, the center section receives all of the radial force generated in the pump casing. Between the center section and the charge pump is interposed a plate of material made of less friction resistance so as to reduce the sliding resistance. The charge pump is simple in construction and inexpensive to produce.

Abstract: A hydrostatic transmission. The hydrostatic transmission generally comprises a sump containing hydraulic fluid, a charge pump in flow communication with the sump for creating high pressure hydraulic fluid from the hydraulic fluid, a center section having hydraulic porting formed therein, a hydraulic pump, a hydraulic motor drivingly connected to the hydraulic pump through the hydraulic porting, and a manifold defining a gallery for storing the high pressure fluid. The gallery is in flow communication with the charge pump and the hydraulic porting.

Abstract: A carrier vehicle having a swing table supported on an under-carriage so as to swing a full turn, and a planetary reduction gear for reducing the revolution of a drive motor and transmitting it to the swing table. The planetary reduction gear is mounted on the under-carriage under the swing table.

Abstract: A housing for an axle driving apparatus which is partitioned therein through an inner wall into a first chamber for housing therein a hydrostatic transmission and a second chamber for housing therein a drive train for transmitting power outputted from the hydrostatic transmission to axles. An oil filter is disposed between the first chamber and the second chamber. The first chamber and the second chamber are filled with oil which can flow between the first chamber and the second chamber through an oil filter, whereby the volume of oil, which varies as the temperature of the oil in the first chamber rises or lowers, can be adjusted.

Abstract: A purification apparatus for removing gases and water from a fluid in a system, including a tank which has an expansion chamber for fluid in the system. A pump pumps the fluid in a circulation circuit of which the purification apparatus is an integral part. A closed chamber has a fluid-free upper part and contains a level-sensing device which controls flow of fluid to the closed chamber. The fluid-free upper part of the closed chamber is connected with a vacuum pump which sucks gases from the closed chamber and creates a lower pressure in the closed chamber than at an outlet of the apparatus. A pressure-generating device sucks fluid from the closed chamber.

Abstract: A hydraulic tile and trim mechanism for a marine outboard drive that provides a compact assembly and which ensures that contaminants which may enter the hydraulic fluid can accumulate in the fluid reservoir and will not be circulated by the fluid pump. This is accomplished by positioning the reservoir below the fluid pump and using a pick-up tube that does not extend into the bottom of the reservoir so that the contaminants can accumulate therein without being circulated.

Abstract: A hydrostatic drive apparatus for transferring power from a light duty vehicle engine to an output axle, including a charge pump for providing additional hydraulic fluid to a hydrostatic transmission in the apparatus, wherein the charge pump is mounted external to the housing of the drive apparatus.

Abstract: A heating element for the reservoir of the hydraulic system of an agricultural tractor is disclosed wherein the heating element is positioned within the interior of the inlet screen member. The heating element is formed with a threaded portion cooperable with the threaded opening of the screen member to permit mounting of the screen member directly on heating element, which in turn is threadably received in the interior wall of the hydraulic system reservoir. The screen member is sealed against the heating element to prevent the leakage of hydraulic fluid into the interior of the screen member. The heating element can be replaced with a stationary stud and sealed against the reservoir wall to allow the mounting of the screen member without utilization of the heating element.

Abstract: A filter arrangement for a single acting, telescopic, hydraulic cylinder, useful to raise and lower a dump truck bed, is configured for installation in one line of a two-line dump pump to filter only hydraulic fluid returning to sump. This is accomplished by a first one-way check valve which blocks fluid flow through a filter element toward the hydraulic cylinder but allows fluid flow from the hydraulic cylinder to sump and a second one-way check valve, disposed in parallel with the filter element, to block flow to the sump from the hydraulic cylinder while allowing flow from the sump to the hydraulic cylinder so that returning hydraulic fluid passes through the filter element. Preferably the filter element is disposed in a spin-on filter assembly which includes the one-way check valves integral therewith.

Abstract: A method of flushing a closed loop hydraulic system utilizes a pair of adapters temporarily disposed between a drive motor and a pair of hoses during the flushing procedure. The adapters block communication between the hoses and the motor and cover the inlet/outlet ports of the motor. By connecting a case drain line to one of the adapters and running the engine to drive a charge pump, oil is circulated through the hose connected to that adapter, the case drain line, a case drain line filter and is returned to a tank. The case drain line is then switched to the other adapter so that oil from the charge pump is circulated through the other hose.

Abstract: A screen member for the hydraulic system of an agricultural tractor is disclosed wherein the screen member is formed with a threaded opening to permit mounting thereof on a stationary stud fixed to the interior wall of the hydraulic system reservoir. The screen member is sealed against the stationary stud by a sealing washer and against the opposing reservoir wall by an O-ring surrounding an access opening through which filtered hydraulic fluid is drawn from the interior of the screen member. The screen member is also formed with a handle projectable through the access opening in the reservoir to facilitate the rotation of the screen member for mounting on the stationary stud. The handle can be formed with an optional square opening for engagement with a standard rachet head to effect rotation of the screen member.

Abstract: A working machine such as a powered lawn mower has a continuously variable transmission for transmitting the power of an engine to wheels at a variable speed reduction ratio. The continuously variable transmission comprises an axial-plunger-type hydraulic pump disposed in a case for producing a hydraulic pressure, and an axial-plunger-type hydraulic motor disposed in the case for producing a rotary motion in response to the hydraulic pressure supplied from the hydraulic pump. The hydraulic pump has a pump cylinder with a plurality of pump plungers axially movably disposed therein, and the hydraulic motor has a motor cylinder with a plurality of motor plungers axially movably disposed therein. The pump and motor cylinders are disposed closely in juxtaposed relationship in the case and having respective axes that are perpendicular to each other.

Abstract: A hydrostatic transaxle having a hydrostatic transmission includes a plate-like dump valve disposed between the transaxle housing or in a recess formed therein, adjacent a fluid conduit that connects the pump and motor of the transmission, the dump valve having fingers which unseat valves in the conduit to relief pressure therein. A rod having an offset portion extends through a bore in the dump valve, the rotation of the rod and offset portion urges the fingers of the plate-like dump valve towards or away from the conduit valves. The settling chamber disposed within the transmission includes protrusions upwardly projecting from the bottom of the chamber which trap particulates suspended in the hydraulic fluid that circulate through the system. A magnet is likewise disposed in the settling chamber adjacent the protrusions for attracting and holding magnetic particles and debris circulated by the hydraulic fluid.

Abstract: An air conditioning system for a motor crane includes a heating circuit and a refrigerating circuit. The heating circuit comprises a hydraulic motor, a hydraulic pump, a radiator and a valve mechanism causing a pressure difference in the hydraulic oil flowing therethrough. The refrigerating circuit includes a compressor connected to the hydraulic motor and a condenser having a fan for forcing air thereover. The heating circuit is at least partially disposed in an air path in which the condenser is disposed. When the hydraulic oil bypasses the valve mechanism, a control device turns the fan on if the refrigerating circuit is not operating, and the temperature of the hydraulic oil sensed by the sensor reaches a predetermined temperature.

Abstract: A device for the improvement of the running conditions in a hydraulic installation or in a so-called hydraulic system. The device contains a central circulating circuit separated from the influence of the atmosphere. To the circulating circuit are connected an outlet and an inlet for the connection of the hydraulic fluid to the other part of the hydraulic system. The circulating circuit is divided into at least two chambers separated by respective pressure generating and pressure reducing units. The first chamber is to a certain extent an expansion room for the hydraulic fluid in the system which is separated from the atmosphere and it forms a low-pressure part in the circuit. The second chamber forms a high-pressure part which is directly connected to the outlet. The circulating circuit holds a medium for the cooling and filtering of the hydraulic fluid.

Abstract: A flotation apparatus for floating minerals from fluid containing minerals in particulate form. The flotation apparatus includes a hydraulic motor directly connected to a drive shaft for driving a rotor located in the flotation cell, the hydraulic motor being powered by a hydraulic power pack having dual gear pumps to circulate hydraulic fluid at pressures of up to 2900 psi to drive the hydraulic motor. The dual gear pumps include a smaller gear pump for developing high pressure at low flow for quick, soft start of the flotation apparatus. Once started, the larger pump automatically takes over to provide high flow at lower pressure to develop rotor speed of approximately 160 RPM.

Abstract: An output pressure control apparatus particularly adapted for HVAC control applications, and being of the general type which admits a higher supply pressure to a controlled output line when it is desired to increase the pressure in the output line and which bleeds pressure from the controlled output line when it is desired to reduce the pneumatic output pressure. The pressure regulating apparatus requires only a single filter means and utilizes bidirectional flow of air through the filter means during normal operation which cleans the filter means.

Abstract: An axle driving apparatus which houses in a transmission casing thereof a hydraulic motor and a hydraulic pump of a hydro-static-transmission and disposes in the transmission casing a center section for connecting the hydraulic motor and hydraulic pump, thereby fixing the center section at the butt joint of the casing and which disposes an oil filter and check valves or the like in the center section so that lubricating oil in the transmission casing is made absorbable as operating oil for the hydro-static-transmission.

Abstract: A vehicle headboard defining a hydraulic oil storage tank for use on a vehicle is disclosed. The vehicle headboard can include a top header, a bottom header, a plurality of spaced apart transfer tubes connected between the top and bottom headers, and mounting brackets attachable to the vehicle. The top header has at least one fluid inlet, a plurality of outlets to the transfer tubes, and receives a portion of hydraulic oil in an interior volume. The bottom header has a plurality of inlets from the transfer tubes, at least one fluid outlet, and also receives a portion of hydraulic oil in an interior volume. The invention is mountable in place of a conventional headboard, and obviates the need for any further hydraulic tank, while placing the storage volume higher than the pump and also improving cooling. The headboard can accommodate various functional storage tank accessories.

Abstract: A tandem master cylinder (1) with central valves (12, 37) positioned in the secondary piston (15), separate from the latter at the end of the cylinder bore (2) and arranged with filter elements (27, 28, 48, 49) upstream of the central valves (12, 37) so as to protect the latter from dirt. In order to be able simultaneously to reduce the total overall axial length, hydraulic fluid flows radially through the filter elements (27, 49) which become effective in the event of a backflow of hydraulic fluid and said filter elements (27, 49) are positioned on the pedal side in respect of the second stop (14) of the secondary piston (15), respectively radially aside the closing spring (46) of the second central valve (37).

Abstract: A seawater power source for providing pressurized seawater to hydraulic ts which utilize the pressurized seawater as their operating fluid. Included in the present invention is a diesel engine for driving a source of compressed air which, in turn, drives a first pump for withdrawing seawater from the ocean and transferring the seawater to a reservoir, and a second pump driven by the diesel engine for withdrawing seawater from the reservoir, pressurizing the seawater and supplying the pressurized seawater to the hydraulic tools. The present invention also includes a unique hose reel which facilitates the changing of tools by allowing an operator to change pressure and fluid flow rate while the seawater power source is operational.

Abstract: A charge flow distribution valve routes all charge pump flow into a main pump until the main pump has sufficient inlet pressure. The valve opens to a first stage which routes excess charge flow to lubrication circuits. At a slightly higher main pump inlet pressure, it also routes oil to an inlet of the charge pump.

Abstract: A steering force control apparatus for a power steering system includes a hydraulic path, a branch path, and a cylindrical filter. The hydraulic path extends from a pump to a power steering side. The branch path has one end open to a wall midway along the hydraulic path and extends to a hydraulic reaction mechanism. The cylindrical filter is adjacent to the wall of the hydraulic path and has a mesh portion for filtering a pressurized oil. The mesh portion is formed at a portion of the cylindrical filter at which the hydraulic path communicates with the branch path. The portion of the filter at which the hydraulic path communicates with the branch path has a tapered stepped portion mechanically formed at the downstream side of the branch path. The cylindrical filter has upper and lower ring frame members to be fitted in the hydraulic path. The lower ring frame member is formed to have an outer diameter smaller than that of the upper ring frame member.

Abstract: An axle driving apparatus which houses in a transmission casing thereof a hydraulic motor and a hydraulic pump at a hydro-static-transmission and disposes in the transmission casing a center section for connecting the hydraulic motor and hydraulic pump, thereby fixing the center section at the butt joint of the casing and which disposes an oil filter and check valves or the like in the center section so that lubricating oil in the transmission casing is made absorbable as operating oil for the hydro-static-transmission.

Abstract: A fluid power apparatus (10) includes a power piston (40) dividing a working chamber (18) from a first chamber (16), the power piston (40) biased toward a rest position by a spring (17) and the piston (40) displaced by means of restricting fluid flow between the working chamber (18) and first chamber (16). In order to keep contaminants from entering the first chamber (16), a collapsible filter (80) is disposed about a piston rod (13) of the power pistion (40), the filter (80) having at an end cap (88) with a central opening (91) through which extends the piston rod (13) and at an opposite end member (98) a flange (95) which serves as a seat (97) for the spring (17). The end member (98) seats sealingly against the power piston (40) while the end cap (88) has a sealing mechanism (92) about the periphery of the central opening (91) to provide sealing between the end cap (88) and input rod (13).

Abstract: The feedback chamber of the pilot pressure valve is supplied with its discharge after it has been filtered whereby the pressure which is supplied to the feedback chamber is subject to the flow restricting effect of the strainer and increases the valve output to compensate for the flow restrictive nature of the strainer.

Abstract: A structure for preventing oil from being contaminated in a hydraulically operated power steering system for use in a motor vehicle has a cylindrical permanent magnet disposed in a working oil chamber housing a rack of an iron-base material and a pinion meshing therewith. The cylindrical permanent magnet has a central opening through which the rack extends, the cylindrical permanent magnet having magnetic poles positioned along a direction parallel to the axis of the rack.

Abstract: A hydraulic fluid supply assembly for an agricultural or industrial tractor or similar vehicle. The assembly includes a mounting plate which closes an aperture in a back axle casing of the vehicle and which carries a hydraulic pump, a pump feed means, and a filter which is mounted on a filter head formed integrally in the plate. The supply assembly is arranged to be demountable from the casing as a unit. The mounting plate also carries one or more hydraulic valves or other hydraulic consumers which receive fluid from the pump via supply passages formed integrally in the mounting plate and a gear wheel which engages with the vehicle drive train to provide drive to the pump when the mounting plate is secured in position over the aperture.

Abstract: In a hydraulic system for a combine harvester, each of three subsystems is supplied with fluid through its own individual reservoir outlet. The total return flows from the three subsystems is distributed between two inlet ports of the reservoir. A pair of wire mesh delivery tubes is connected between the respective return inlet ports and two of the outlet ports. The hydraulic circuitry is arranged so that the return flow at each inlet port exceeds the supply flow demanded at the corresponding outlet port so that, while some of the return fluid is directly recirculated through the delivery tube to that outlet, there is a net flow outwards through the wire mesh of the tubes to mix with the fluid supply held in the reservoir.

Abstract: An axial piston pump is provided having a cylinder drum, the end face of which lies against a control bottom pickup element, in which an approximately semi-circular suction channel and an approximately semi-circular pressure channel are located, where each of these two channels extend in the control bottom pickup element to a connection opening, in which case a device for trapping impurities, preferably a sieve, is installed in the suction channel inside of the control bottom pickup element.

Abstract: A hydraulically operated mining shovel comprises a stick which is pivotable in opposite directions by a pair of extendible/retractable double-acting hydraulic cylinders. A high-pressure hydraulic system is provided for operating and controlling the cylinders and comprises a fluid reservoir, a pump for supplying high-pressure hydraulic fluid, and a selector valve located between the pump and the cylinders and between the cylinders and the reservoir. A main filter, removable for cleaning, is located in a fluid return line leading to the reservoir. A self-cleaning filter assembly is connected in each fluid supply/return line connected between the selector valve and a hydraulic cylinder. Each filter assembly comprises a housing in which a pair of cone-shaped fine-mesh filters are connected in parallel with each other and in parallel with an adjustably one-way check valve.

Abstract: Coaxial bidirectional spool valves are provided for use in fluid systems such as hydrostat systems where flow can proceed in opposite directions, and which direct flow through a unidirectional or multidirectional function such as a filter assembly in the normal direction regardless of the direction of flow in the system. The valve includes a spool valve reciprocably movable between two limiting positions according to fluid pressure differential across the valve and engaging one of a pair of bungee followers in each position, thereby intercepting and controlling flow through a box junction of the fluid line with the lines leading to and from the filter assembly in a manner such that, regardless of the direction of flow in the fluid line, flow proceeds in the same direction in the connecting fluid lines to and from the function.

Abstract: A tank assembly for a hydraulic system including a hydraulic load device and a transmission. The tank assembly comprises a tank, a weir mounted on the bottom wall of the tank, which weir functions as a partition wall for dividing the inside of the tank into a first and a second reservoirs and allows fluid to overflow from the first reservoir to the second reservoir, the first reservoir being adapted to receive fluid from both the hydraulic load device and the transmission, a dust collector mat disposed on the bottom wall of the tank for collecting dust from drained fluid, and a strainer mounted inboard on one of the side walls of the tank and extending within the second reservoir.

Abstract: The invention relates to a cleaning unit for power driven pumps which are required to pump fluids containing significant quantities of particulate material of greater spcific gravity than the fluid. A portion of the pressured fluid output of the pump is utilized to drive a fluid motor which in turn rotatably drives a centrifugal separator. The separator has its inlet connected to the source of particulate containing fluid and effects the centrifugal separation of such fluid into two streams, respectively a clean fluid stream and a particulate containing stream. Means are provided for discharging the particulate containing stream and a diffuser means is provided for converting the rotational energy in the clean fluid stream into a pressure head which is employed to transfer the clean fluid to the inlet of the pump.

Abstract: A hydrostatic transmission control system including a variable displacement pump driving a constant displacement motor arranged in a hydraulic circuit having a controlled by-pass valve interconnected for positioning the pump swash plate in two established positions corresponding respectively to a stand still position or a full speed position of the motor. A thermosensitive element is coupled to the valve control spool for bypassing the flow of the pump in the event of motor jamming.

Abstract: A hydraulic system having a reservoir fed charge pump supplying pressurized fluid through a charge passage and a filter to the inlet of a supply pump for direction controlled fluid devices includes a reservoir connected unloading valve assembly connected to the charge passage and parallel with the filter. The fluid devices return fluid through a return passage connected to the unloading valve assembly which maintains back pressure on the devices at charge passage pressure. The unloading valve assembly includes an unloading valve movable in response to a predetermined fluid pressure at the inlet of the supply pump to unload the charge and return passage by connecting them to the reservoir. As the devices require more fluid from the supply pump causing the pressure at the inlet of the supply pump to drop, the unloading valve proportionately blocks the charge and return passages from the reservoir to circulate return fluid into the charge passage.

Abstract: A hydraulic system having a reservoir fed charge pump supplying pressurized fluid through a filter to a supply pump for direction controlled fluid devices includes an unloading valve assembly on the return passage from the devices for limiting back pressure therefrom as long as the charge pump supplies sufficient pressurized fluid for the supply pump. The unloading valve assembly includes an unloading valve movable in response to the pressurized fluid at the connection between the supply pump and the filter to unload the return passage by connecting it to the reservoir and further to control the pressurized fluid going to the filter by connecting the charge pump to the reservoir at a predetermined maximum pressure of pressurized fluid. As the decvices require more fluid from the supply pump causing the pressure to the supply pump to drop, the unloading valve first blocks the charge pump from the reservoir and then the return passage.

Abstract: A combination shuttle and high pressure relief valve is provided within a hydrostatic drive or transmission system. The valve is constructed with a spool member in two sections. The sections include hooks that interact with one another to lock the spool sections together in one mode of operation, yet permitting the spool sections to act independently in another mode of operation. Complete fluid charging of the fluid system is ensured by dual flow circuitry between the system pump and motor, while a restrictor valve means is connected to the shuttle and pressure relief valve to provide continuous flow of fluid through a system filter.

Abstract: In a fluid filter device particularly suited for installation in an automotive power steering system, a cylindrical filter element which is axially movable in a casing having inlet and outlet passages at its opposite ends includes a foraminous side wall constituting a primary filter and a valve member at one end of the filter element normally urged to engage a seat about the opening of the inlet passage by a spring acting on the filter element so that, when the primary filter becomes clogged, the buildup of the differential pressure between the inlet and outlet passages causes axial movement of the filter element for unseating the valve member and permitting the fluid to bypass the primary filter through an annular clearance between the latter and the casing wall, and a secondary filter annulus extends from the filter element across such annular clearance for filtering the fluid which bypasses the primary filter.

Abstract: A closed-loop hydrostatic drive unit having a variable displacement fluid pump driven by an electric motor for generating high-pressure fluid adapted to be communicated to a fluid motor and returned to the fluid pump via a high-pressure filter. The closed-loop hydrostatic drive unit is mounted to a rectangularly-shaped reservoir housing having upper and bottom surfaces connected by side walls and end walls to define therein a chamber for the storage of fluid at a low pressure which is communicated to the fluid pump via a charge pump and suitable conduits and check valves. In a first embodiment of the invention the interior of the reservoir housing is divided by means of a partition to define the fluid-holding chamber, while the remaining portion of the reservoir housing defines a separate chamber for the mounting and storage of the high-pressure filter and/or other selected fluid power components.

Abstract: A hydraulic system having a plurality of motor driven pumps in parallel legs, at least one being active and one in reserve, so combined with sensors to sense pump efficiency and filter efficiency that a condition deemed pump failure or filter failure results in activating the reserve leg and deactivating the inefficient leg. Other sensors detect flow meter failure and establish warnings of conditions deemed near-failure. The system may be duplicated both on the pressure side and return side of the pumps. The system reservoir is characterized by a tank for return fluid to be cleaned and a separate tank for the fluid to be delivered under pressure; so constructed as to (a) remove turbulence, (b) prevent vortex overlap, (c) remove silt fines and (d) maintain a proper pumping level.

Abstract: Hydrostat systems are provided containing a coaxial multidirectional flow control valve interposed between a pump and a hydraulic motor, to direct flow in one direction through one path and to direct flow in the opposite direction through another path, to provide a bypass function, such as to bypass a filter. The valves are space-saving, can be kept closed under low biasing forces, and can be made light in weight, affording a low-mass valve that can be moved in milliseconds from a closed to an open position. The valves can control not only different forward and reverse flow paths, but also a path for a bypass function such as relief flow through one of the forward and reverse flow paths. When two valves are used, unidirectional flow through can be achieved regardless of direction of flow in the fluid line.

Abstract: In order that a hydraulic pump and a hydraulic motor of a hydrostatic transmission hitherto disposed to the exterior are attached to a hydrostatic transmission support member provided in a mission case, a charging pump hitherto attached to the hydraulic pump at the hydrostatic transmission is also attached to the hydrostatic transmission support member, and an oil filter hitherto attached to the outside of mission case is disposed therein, they are interposed between the lower surface of hydrostatic transmission support member and the charging pump. Furthermore, an outward takeout pump also is supported in the mission case.