Abstract: A motor mounted on a drone includes a rotor including a propeller mounting portion with a propeller detachably attached, the rotor being rotatable about a central axis, a stator radially facing the rotor with a gap therebetween, and an auto-balancer capable of automatically correcting dynamic balance of the rotor.

Abstract: A fluid pressure rotary machine includes a cylinder block that is fixed to a rotary shaft and includes a plurality of cylinder bores, a piston disposed to be free to slide in each cylinder bore such that a volume chamber is defined thereby, a swash plate that causes the piston to reciprocate such that the volume chamber expands and contracts, and a valve plate that slides against the cylinder block and includes an intake port and a discharge port communicating with the volume chamber. The valve plate includes a sliding surface formed to project in a spherical shape against the cylinder block. The cylinder block includes a sliding surface formed as an indentation corresponding to the shape of the sliding surface of the valve plate. A minute gap is formed between the sliding surface of the valve plate and the sliding surface of the cylinder block in an outer edge position.

Abstract: An apparatus for accommodating fluid expansion and contraction within an axle housing or axle support structure of a hydrostatic transaxle is provided. A partitioning element separates the hydraulic fluid from an air chamber created at least partially by the partitioning element and the partitioning element extends around a portion of the axle and at least a portion of the partitioning element is movable along the longitudinal axis of the axle to expand the volume of the sump.

Abstract: A non-invasive blood pressure monitoring system, includes an air channel having one or more inlet and exhaust ports to ambient air. An electronically controlled pump inflates and deflates a cuff applied to a patient limb with air via the air channel. A water tight sealed housing containing electronic circuitry for processing signals used in deriving a measurement of patient blood pressure in conjunction with inflating and deflating the cuff. The water tight sealed housing also is sealed from the air channel.

Abstract: In at least some embodiments, an apparatus includes a hydraulic directional control manifold and a plurality of electric piezopumps. The apparatus also includes an electric piezopump controller that operates the plurality of electric piezopumps in varying combinations to provide generation and directional control of hydraulic power to linear hydraulic actuators using localized closed-loop hydraulic fluid.

Abstract: A hydraulic drive unit having a center section for a hydraulic pump and hydraulic motor mounted in a casing. The center section includes a cylindrical protuberance for locating the center section in the casing, and at least one fastener opening formed in the center section for receiving a fastener engaged to the casing. The drive unit may also include a pair of flat surfaces formed on the center section and adapted to mount with features in the casing, and a bypass shaft extending into the casing and at least partially disposed in the center section.

Abstract: A compact, integrated hydrostatic transmission without reduction gearing wherein the pump and motor are contained within a single housing, and an output shaft extends from the housing inline with a shaft of the motor. The output shaft is directly connectable to a wheel of a vehicle. The pump and motor share a common sump within the housing in which pump and/or motor leakage is collected.

Abstract: A hydraulic drive device including a hydraulic pump and hydraulic motor disposed in a casing and driving an axle having an interior end disposed inside the casing and abutting against an interior surface of the casing to prevent an inward axial movement of the axle shaft. The device further includes an expansion chamber formed in the casing by a plate having a generally flat portion extending generally perpendicular to the plate to form a thumb stop and an indentation sized to accept a human finger to assist during installation of the plate.

Abstract: A hydrostatic drive axle has two hydrostatic axial piston motors utilizing a swashplate design located coaxially next to each other, the control sides of which face each other. Tubular terminal segments (1a) of the drive axle are in the form of axial piston motors (2) and are shaped and fitted on a center segment (1b), in which there is a control base seat (3) that is common to the two axial piston motors (2). To make possible easy assembly and disassembly, the control base seat (3) is shaped and fitted in the center segment.

Abstract: A hydrostatic transmission assembly includes a first gerotor motor, a pump housing, a first variable displacement pump, a second gerotor motor, and a second variable displacement pump. The first gerotor motor includes a first output shaft aligned along a first axis. The pump housing connects to and contacts the first gerotor motor. The first variable displacement pump includes a first driven shaft mounted to the pump housing and aligned along a second axis, the second axis being generally perpendicular to the first axis (the first output shaft axis). The first variable displacement pump is in fluid communication with the first gerotor motor via passages in the pump housing. The second gerotor motor includes a second output shaft generally aligned along or generally parallel to the first axis. The second gerotor motor is connected to the pump housing on an opposite side of the pump housing as the first gerotor motor.

Abstract: A hydrostatic transmission assembly includes a first gerotor motor, a pump housing, a first variable displacement pump, a second gerotor motor, and a second variable displacement pump. The first gerotor motor includes a first output shaft aligned along a first axis. The pump housing connects to and contacts the first gerotor motor. The first variable displacement pump includes a first driven shaft mounted to the pump housing and aligned along a second axis, the second axis being generally perpendicular to the first axis (the first output shaft axis). The first variable displacement pump is in fluid communication with the first gerotor motor via passages in the pump housing. The second gerotor motor includes a second output shaft generally aligned along or generally parallel to the first axis. The second gerotor motor is connected to the pump housing on an opposite side of the pump housing as the first gerotor motor.

Abstract: A hydraulic drive apparatus having a pair of hydraulic pumps and a pair of hydraulic motors mounted on a common center section in a housing is disclosed. Each hydraulic motor is engaged to an adjustable swash plate located in the transmission housing for adjusting the fluid displacement thereof and an actuator mechanism for adjusting the position of the swash plate. Separate axle housings are mounted on the ends of the transmission housing for housing output axles that are operatively connected to the output shafts of the respective hydraulic motors.

Abstract: A dual tandem pump apparatus having a pair of coaxially arranged pump shafts and a separate input shaft that is not coaxial with the pump shafts. The trunnion arms for the two pumps may be mounted in different locations to increase application flexibility. Charge pumps may be mounted on end caps secured to the housing or may be driven directly by the input shaft. A coupler or bevel gear arrangement is used inside the pump housing to drive the pump shafts from the input shaft.

Abstract: A transaxle comprised of a hydrostatic transmission mounted in a transmission housing and having a pair of hydraulic pumps and hydraulic motors operatively connected together through a center section mounted in the housing. First and second axle housings are mounted on opposite ends of the transmission housing, with output axles mounted in the axle housings and connected to the respective hydraulic motors.

Abstract: A hydraulic circuit for a hydraulic excavator having a motor drive which acts on at least two closed drive circuits which are connected in parallel, each have a hydraulic pump and a hydraulic motor and which operate on a common output drive, connecting lines being provided between the hydraulic pump and the hydraulic motor of a respective drive circuit, is intended to be improved such that mutual contamination of the components of different driving means with particles in the event of damage is largely avoided and it is also made easier to ascertain the damage. This is achieved by the connecting lines (L11, L12; L21, L22) of each drive circuit (A1, A2) being arranged only between the hydraulic pump (P1, P2) and the hydraulic motor (HM1, HM2) of the respective drive circuit (A1, A2) in such a way that there is no hydraulic connection between the different drive circuits (A1, A2), the respective drive circuit (A1, A2) each having its own control valve (S1, S2) connected to it.

Abstract: A center section for a hydraulic pump and motor mounted in a transaxle casing. The center section has a protuberance formed thereon, a pair of flat surfaces separate from the protuberance and at least one fastener opening formed in the center section for receiving a fastener engaged to the casing. The protuberance is adapted to mate with a center section locator formed in the casing to establish an X-Y orientation for a central axis while the fastener provides a Z-axis locator for the center section.

Abstract: A transaxle comprised of a hydrostatic transmission mounted in a transmission housing and having a pair of hydraulic pumps and hydraulic motors operatively connected together through a center section mounted in the housing. First and second axle housings are mounted on opposite ends of the transmission housing, with output axles mounted in the axle housings and connected to the respective hydraulic motors.

Abstract: The vehicle has two groups of displacement members (1, 2, 3, 4), one of which groups is steerable. The apparatus comprises a closed transmission circuit which includes a pump (50) and hydraulic motors (10, 20, 30, 40). A first group of motors that serves to drive two displacement members on the same axle comprises at least two double motors (30, 40), each having two operating cubic capacities forming two elementary motors (31, 32; 41, 42). The first elementary motor (31, 41) of each of the double motors is connected to the pump (50) in parallel with a motor (10, 20) of the other group, while the second elementary motor (32, 42) is connected in series with said motor of the other group. There thus exist first and second series ducts (C32, C42) between the motors.

Abstract: A pair of substantially mirror image, zero-turn, hydrostatic transaxles (HZTs) that may be joined to form an integrated, zero-turn, hydrostatic transaxle. The control arm and brake mechanism associated with the HZTs can be mounted on either the inboard or outboard side of the HZT casing. In one embodiment, an integrated, inboard brake mechanism is provided for the joined HZTs.

Abstract: In a power transmission arrangement, a working unit includes a hydraulic power unit and a valve unit enclosed in a first bulging portion of a transmission case closer to an upper side or on a top surface thereof and connected with each other along a vehicle lengthwise direction. The first bulging portion is closer to a first lateral side along the vehicle width direction of the transmission case, while a hydraulic pump is located closer to a second lateral side. Hydraulic fluid is drawn from the transmission case, around a lower side of the hydraulic pump, through a suction port thereof, and discharged to a suction port of the valve unit. The hydraulic power unit includes a cylinder tube and piston, extending in the lengthwise direction, and support shaft, extending along the width direction, which is supported by the transmission case and connected to a lift arm.

Abstract: A hydraulic synchronizer for a plurality of hydraulic actuators has at least a pair of hydraulic fluid-holding chambers of variable fluid-holding volume. The synchronizer has a number of separate preferred features, each of which is optional depending upon the intended application of the synchronizer. These optional preferred features include an improved fluid passageway arrangement, a pneumatic pressure source, separate relief valves associated with each chamber, the capability to accommodate hydraulic fluid-holding chambers of different fluid-holding volumes concurrently, and the capability to detachably interconnect multiple synchronizer modules.

Abstract: An axle driving apparatus including a housing which houses an input shaft having a longitudinal axis of rotation, axles having a lateral axis of rotation and a power-take-off shaft having a longitudinal axis of rotation. The housing may include a first housing member, a second housing member and a third housing member longitudinally joined with one another. A partition is disposed at a vertical center of the first and second housing members and divides the interior thereof into a first and a second chamber. A third chamber is formed between the second and third housing members. An hydrostatic transmission is disposed in the first chamber. A transmitting mechanism drivingly connecting the hydrostatic transmission with the axles is disposed in the second chamber. Another transmitting mechanism drivingly connecting the input shaft with the power-take-off shaft is disposed in the third chamber.

Abstract: A precipitation device for removing pieces of metal from the lubricating fluid for a transmission includes a screen in the path of flow of the lubricating fluid and a permanent magnet at one end of the screen. The screen is made of a nonmagnetic material such as aluminum and is mounted on a transmission bearing plate so as to be parallel to the main flow path for the lubricating fluid so that partial streams of the lubricant pass through openings in the screen.

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 differential rotation control device with a hydraulic assembly includes two torque transmission assemblies. Each assembly has a first rotor with a pump-driven arrangement secured to a drive shaft which is common to both of the torque transmission assemblies, and a second rotor with a torque-receiving arrangement rotatably supported on the drive shaft. The torque-receiving arrangement is rotated when hydraulic power is applied to the pump-driven arrangement so that the rotation speed ratio between the first and second rotors can be variably set. The two pump assemblies each have a pump-driving arrangement assembled to the first rotor for constituting a circular route together with the pump-driven arrangement for circulating fluid. A pump-regulating arrangement controls fluid supplied to the pump-driven arrangement when the drive shaft is rotated relative to a pump-stator to which the pump-regulating arrangement is secured.

Abstract: A homopolar motor-generator comprising two homopolar machines in series with a conductive belt transmitting current between the rotors of the machines which are caused to rotate in synchronism in oppositely directed magnetic fields to allow extraction of current from relatively low surface speed surfaces.

Abstract: A hydrostatic transaxle assembly T is disclosed including a pump (11), a manifold portion (13), and right and left motor axle assemblies (15 and 17). Each of the motor axle assemblies includes a radial ball motor (41), the output of which is the input to a gear reduction section (53). Each gear reduction section (53) includes primary and secondary planetary gear sets (55) and (57) including a planet carrier (79) driving the respective axle shaft. The transaxle assembly T includes a locking differential and parking brake mechanism (87) which comprises an engagement mechanism (89) and an actuation mechanism (91). When the engagement mechanism (89) is disengaged, the motor assemblies (15) and (17) are free to operate at different speeds for normal differentiation. The actuation mechanism (91) can be actuated to either a locking differential mode (FIG. 8) or a parking brake mode (FIG. 9).

Abstract: A hydraulic intensifier having a hydraulic motor driven from a low pressure source and operable to drive a low pressure pump for sucking oil from a reservoir and for delivering the oil as charge oil to a high pressure pump. The latter also is driven by the hydraulic motor and pressurizes the charge oil so as to deliver oil at high pressure to a hydraulic actuator. The intensifier is of a self-contained and modular construction and includes a case which defines the oil reservoir and which is closed by detachable end caps permitting the motor and the low pressure pump to be pulled out of one end of the case and permitting the high pressure pump to be pulled out of the other end of the case.

Abstract: A hydrostatic transaxle assembly having first and second output shafts extending outward therefrom. The assembly includes a housing enclosing a portion of the first and second output shafts and forming a generally cylindrical chamber therein. A manifold is positioned around one of the output shafts and has an outer surface which mates with an inner surface of the housing. A pair of high torque, low speed motors are secured to an inner surface of the housing on opposite sides of the manifold. One of the motors is splined to the first shaft while the other motor is splined to the second shaft. Operation of the motors cause the respective shafts to rotate. The motors operate on pressurized fluid which is supplied through fluid passages. A control valve is positioned across the fluid passages to regulate the operation thereof.

Abstract: A fluid power apparatus for converting steam to hydraulic energy having one or more pairs of linear steam and linear hydraulic cylinders arranged symmetrically and with their axis parallel about a steam generator. The rod ends of the cylinders are connected to a wobble plate. Valving directs steam in and out of the steam cylinders and as the steam cylinders reciprocate, the corresponding hydraulic cylinders will be reciprocated generating hydraulic fluid pressure. Valving is accomplished by valving plates rotated by the wobble plate or by means of a slide valve positioned by a wobble plate actuated linkage.

Abstract: The rotary machine comprises: a stationary housing having an interior profile defining a monolobic configuration; a rotary cylindrical body arranged eccentrically in the housing and including a series of arc-shaped segments mounted in circular alignment in the housing and spaced to define therebetween a series of radial slots; interfitted double vanes slidably received in the slots; and counterweight means mounted in the body and disposed adjacent each blade portion of the double vanes; during rotation of the body, the counterweight means at one end of one double vane gradually opposes the movement of the said one double vane while, simultaneously, at the opposite end of the same double vane, the counterweight means are gradually removed from this opposite end of the blade portion whereby the centrifugal forces acting on the double vanes are balanced and vane pressure on the housing is minimized.