Abstract: A lubricant delivering coupling adapted to interconnect a power transfer unit and a load having a rotary input. The coupling is comprised of a pair of concentrically disposed inner and outer hollow members. The outer member is in a torque transmitting relationship between the power transfer unit and the load. The inner hollow member is secured at both ends to an inner surface of the outer member and is adapted to receive lubricant from a lubricant source within the transfer device for delivery to and through the hollow inner member.The inner and outer members each have intermediate the respective ends thereof a shear section. Upon overloading of the outer member and the shearing failure thereof, the inner member continues to twist until rupture at the inner member shear section.

Abstract: This invention relates to a unidirectional high gain brake arrangement that includes in combination a shaft mounted for rotation within a housing. The shaft is rotatable in either direction. A brake is selectively releasably coupled to the housing and to the shaft. The brake has a first member. An intermittent motion device is respectively coupled through the first member to the housing and through a one-way clutch to the shaft. The brake also has a second member that is mechanically coupled to the first brake member and to the housing. The intermittent motion device causes the brake to be activated by movement imparted to the first brake member after a preset number of revolutions of the shaft in one direction. The brake is released by rotation of the shaft in an opposite direction whereby torque transmitted through the one-way clutch to the first brake member is removed.

Abstract: The invention is directed to a unitary cage assembly annularly positioning a plurality of rollers in a pair of roller bearings supporting a cradle swashplate. By utilizing the unitary cage assembly, a parallel relationship between the rollers is assured and, furthermore, only a single locating mechanism for the unitary cage assembly is required.

Abstract: The present invention is directed to a compact, lightweight and inexpensive hydrostatic transmission which in the preferred form has a variable displacement and reversible pump placed in side-by-side relationship with a fluid motor and wherein the transmission has a multisection housing with a uniform width center section forming both the pump chamber and the motor chamber. The fluid capacity of the pump and the fluid capacity of the motor are proportional to their widths and the ratio of the fluid capacity remains constant as various width center sections are used.

Abstract: This invention relates to a motor control circuit for a permanent magnet motor having a rotor and motor windings. A motor winding transformer circuit is coupled to motor windings and provides an output signal representative of the magnitude and direction of the real current present in the motor windings. A rotor speed/position sensing circuit provides an output signal representative of the motor speed and direction.

Abstract: Inertial measurement of the angular rotation and translational motion of a structure can be provided by a pair of vibrating accelerometers aligned in a side-by-side arrangement with their force sensing axes in the same direction and vibrated to and away from each other along an axis normal to their force sensing axes.

Abstract: The age old problem of monitoring a liquid level in a reservoir has continued to cause problems. If the level is too low, the component will malfunction due to lack of lubricant; on the other hand, if the level is too high, the component can overheat. The present system overcomes the problem of the level being too high by providing an automatic vent for draining excess liquid from the reservoir. When the engine is in the nonoperating mode, the spring moves the spool of the valve to the open position. In the open position, excess liquid is vented from the reservoir establishing the predetermined liquid level. When the engine is operating, a portion of the air from the compressor enters the chamber forcing the spool to the closed position preventing liquid from being vented from the reservoir. In the closed position, contaminants are also prevented from entering the reservoir.

Abstract: The invention relates to a swashplate leveling and holddown mechanism wherein an axially sliding leveling mechanism is biased into engagement with a swashplate of an axial piston variable displacement hydraulic unit to position the swashplate in a zero displacement position when there is no control input to the hydraulic unit. The leveling mechanism has a pair of contact points, one positioned on each side of the swashplate tilt axis in a manner that both contact points positively engage the swashplate when it is centered to its zero displacement position. Such mechanism requires no spring adjustment and has no backlash. Furthermore, the axial bias on the leveling mechanism helps seat the swashplate in its support bearings. Utilized in conjunction with the leveling mechanism is an axially biased control input which operates on the opposite side of the swashplate to further hold the swashplate in its support bearings.

Abstract: A method of making a segmented externally finned tube with at least one fin free area for use in a heat exchanger. The method includes the steps of providing a tape of thermally conductive material with spaced reliefs along one longitudinal edge thereof and slitting the tape from that edge partially across its length between the reliefs. The slit portions of the tape are bent to form an angle with respect to the remainder of the tape which is then used to helically wrap a thermally conductive tube. The area of the reliefs provide fin free areas.

Abstract: This invention relates to a compact high efficiency furnace having a cylindrical combustion chamber and a fin and tube type heat exchanger substantially parallel, transverse to the furnace air flow, and closely spaced in the air flow direction with no other major heat exchange being utilized. Condensation of fluids from the combustion gases occurs at the fin and tube type heat exchanger, whereby a high efficiency furnace results. The fins and tubes of the heat exchanger are of different materials, requiring that the combustion gas temperature at the heat exchanger inlet be limited.

Abstract: A thin valve plate for use in an axial piston hydraulic unit wherein valve plate ports are provided with slot shaped extensions passing through the valve plate to provide limited initial fluid communication between cylinder block ports and valve plate ports and wherein the thickness of the valve plate is no greater than one half the width of the slots. Furthermore, such valve plate facilitates economical manufacture wherein the slots and valve plate ports can be stamped in a hardened steel disk.

Abstract: An electromotive machine has a stator provided with multiple sets of windings, each independently, electrically coupled to an electrical means, to establish separate power channels between the windings and the electrical means that allow for the simultaneous independent transmission of power through the channels when the machine is in operation. The electromotive machine may take either the form of a motor or a generator.

Abstract: This invention relates to a motor control system for a brushless DC motor having an inverter responsively coupled to the motor control system and in power transmitting relationship to the motor. The motor control system includes a motor rotor speed detecting unit that provides a pulsed waveform signal proportional to rotor speed. This pulsed waveform signal is delivered to the inverter to thereby cause an inverter fundamental current waveform output to the motor to be switched at a rate proportional to said rotor speed. In addition, the fundamental current waveform is also pulse width modulated at a rate proportional to the rotor speed.A fundamental current waveform phase advance circuit is controllingly coupled to the inverter.

Abstract: The present invention is directed to a two stage hydraulic servo amplifier wherein the boost stage valve comprises two separate valve members, each individually controlling one of a pair of controlled outputs and wherein the position of each valve member is modulated by inputs from a pilot stage acting against separate biasing forces for each valve member.

Abstract: The invention relates to a torsionally stiff door adapted to be mounted for pivotal movement at points on a line parallel to an edge of the door and to be latched at a point along an opposing edge of the door. The door is intended for use in an environment where one side of the door is subject to loading over that surface. The door is also subject to highly directional point loading on the other side of the door. The surface loading and the point loading tend to torsionally bend the door about lines passing through the points, which lines intersect at the latch. The door is fashioned of a pair of spaced apart panels which form respectively one side of the door and the other side of the door.

Abstract: The present invention provides an improved control system for a driven cable reel mounted on a vehicle wherein the reel is adapted to pay-in and pay-out electrical cable to supply power to the vehicle, such as a mine car. The control system modifies the torque supplied by the reel drive so as to maintain a relatively constant tension on the cable. The improved control system has a first or basic output which provides higher torque when the reel is paying in cable and provides lower torque when the reel is paying out cable, the difference in drive torque being necessary to compensate for the reversal of frictional characteristics during paying in and paying out of the cable. The control system further provides a transient condition output signal to modulate the drive of the cable reel in a manner which compensates for acceleration and deceleration of the cable reel to reduce cable slack and prevent a sudden increase in cable tension which could cause cable breakage.

Abstract: The invention is directed to a multi-motor actuation system for a power drive unit. The system includes three independently hydraulically controlled motors adapted to be drivingly coupled to a power drive unit output. Two of the said motors are normally active at all times and the third motor acts as a back-up motor to provide redundancy for the two normally active motors. A hydraulic failure detection mechanism is controllingly coupled to the three independently hydraulically controlled motors. The hydraulic failure detection mechanism is responsive to any failure of one of the normally active hydraulically controlled motors to thereby cause the third motor to be coupled to the power drive unit. The failure detection mechanism is additionally responsive to a failure of both normally active hydraulically controlled motors to cause the third motor to take over the functions of both of the normally active hydraulically controlled motors.

Abstract: In order to vary the brightness of the display produced by a cathode ray tube, a digital brightness control circuit is provided that utilizes a source of cathode control voltage connected to the cathode of the cathode ray tube, a brightness selector circuit which is connected to a digital counter, and a resistance network connected to the counter and the cathode control voltage source which is effective to vary in discrete increments the brightness of the cathode ray tube.

Abstract: An electro-hydraulic control structure having a control input positioning a flapper relative to a nozzle to generate a control output pressure is provided with a squeeze film damper which utilizes the flapper, or an extension thereof, as the movable element of the squeeze film damper. Preferably the flapper is pivoted and forms with the nozzle exhaust passageway a tapered gap receiving a small portion of the nozzle flow which acts as the damping fluid. The majority of the nozzle flow passes through a hollow portion of the flapper located downstream of the nozzle.

Abstract: The present invention is directed to a fuel supply system for a fuel burner of the type that requires for proper operation an excess flow of fuel to be provided to the burner with that excess being recirculated. The fuel system further requires that sufficient fuel is added to the system to make up for that amount of fuel which is fired or burned. The fuel supply system includes a fuel pump which selectively draws from a fuel supply the make-up fuel flow and from a return path the excess fuel flow for recirculation. At any given moment all fuel flow from one inlet line and the other inlet line is positively closed.