Abstract: A control device for a power machine includes a target circuit pressure specifying unit configured to specify a target circuit pressure of the hydrostatic continuously variable transmission, a measurement value acquisition unit configured to acquire an actual circuit pressure of the hydrostatic continuously variable transmission, a brake torque determination unit configured to determine a brake torque based on the target circuit pressure and the actual circuit pressure, and a pump control unit configured to control the hydraulic pump based on the brake torque. The brake torque is a torque consumed by the hydraulic pump.

Abstract: A hydraulic system includes: a slewing motor; a mechanical brake; and a slewing control valve interposed between a main pump and the slewing motor. A first pilot port of the slewing control valve is connected to a first solenoid proportional valve by a pilot line. A second pilot port of the slewing control valve is connected to a second solenoid proportional valve by a second pilot line. The first solenoid proportional valve and the second solenoid proportional valve are connected to an auxiliary pump by a primary pressure line. A switching valve is interposed between the auxiliary pump and the mechanical brake. The switching valve includes a pilot port that is connected to the first pilot line by a switching pilot line. The valve switches from a closed to an open position when a pilot pressure led to the pilot port becomes higher than or equal to a setting value.

Abstract: A hybrid hydraulic fracturing system having a driveline that includes an internal combustion engine having a crankshaft, a motor operatively coupled to a forward end of the crankshaft, a transmission operatively coupled to a rearward end of the crankshaft, a driveshaft operatively coupled to the transmission, and a fracturing pump operatively coupled to the driveshaft. The system also includes a power source electrically coupled to the motor for supplying power to the motor and a controller configured to power condition the driveline by operating the driveline in a first mode in response to a load change resulting in an increased power demand on the driveline, where the first mode includes providing torque from the internal combustion engine to drive the fracturing pump and selectively providing torque from the motor to a crankshaft of the internal combustion engine to assist the internal combustion engine in driving the fracturing pump.

Abstract: Provided is a working vehicle capable of, while reducing fuel consumption, improving traveling performance only when high traveling performance is required. A wheel loader 1 comprises: an engine 3; a variable displacement HST pump 41; a variable displacement HST motor 42 connected to the HST pump 41 through a closed circuit; pressure sensors 72A, 72B configured to load pressure of the HST motor 42; and a controller 5, wherein the controller 5 is configured to, in a case of determining that a load pressure detection value P is included in a predetermined pressure range of greater than load pressure P? corresponding to flat ground traveling and smaller than load pressure P? corresponding to an excavation operation, increase maximum rotational speed of the engine 3 only within the predetermined pressure range.

Abstract: A hydraulic device includes a braking device to brake a traveling device and release braking of the traveling device, a traveling pump to drive the traveling device with pressure of operation fluid, a brake-operation valve to control operation fluid flowing to the brake device, a traveling operation valve to control operation fluid flowing to the traveling pump, a first discharge fluid tube to discharge operation fluid flowing through the brake-operation valve, the first discharge fluid tube being connected to the brake operation valve, and a second discharge fluid tube to discharge operation fluid flowing through the traveling operation valve, the second discharge fluid tube being connected to the traveling operation valve. The traveling operation valve has a set pressure that is set to be higher than a brake set pressure set by the brake operation valve.

Abstract: A hydraulic system includes a hydraulic pump to discharge an operation fluid, a hydraulic device to be operated by the operation fluid, a plurality of hydraulic pressure controllers each to change an operation state of the hydraulic pressure controller based on a pressure of the operation fluid so as to control the hydraulic device, and a proportional valve connected to the plurality of hydraulic pressure controllers. The proportional valve is configured to set a pressure of the operation fluid supplied to the hydraulic pressure controllers.

Abstract: A hydraulic control system may include a closed loop hydraulic circuit with at least one hydraulic motor. A plurality of variable displacement pumps may be fluidly connected in parallel in the closed loop hydraulic circuit. A plurality of hydraulic actuators may be configured to adjust the displacement of the variable displacement pumps. A pilot valve assembly may be configured to supply the hydraulic actuators with hydraulic fluid having a pilot pressure corresponding to a desired displacement of the variable displacement pumps. A pressure regulating device may be configured to limit the pilot pressure of the hydraulic fluid supplied to the hydraulic actuators when a working pressure in the closed loop hydraulic circuit reaches a maximum allowable working pressure.

Abstract: A vehicle including a pump apparatus having a housing in which an end cap is disposed, and a mower deck is disclosed. Multiple hydraulic pumps driven by a prime mover are mounted on the end cap and connected to hydraulic ports formed in the end cap. An auxiliary pump may be drivingly coupled to the prime mover and a power take off unit may also be connected thereto to drive the mower deck. The end cap may further include a charge pump mounting surface and a charge port for connecting a charge pump.

Abstract: A vehicle includes a transmission, an electrically-driven fluid pump which supplies pressure to a hydraulically-actuated clutch of the transmission, and pump motor sensors positioned with respect to a pump motor of the fluid pump. The sensors are configured to measure electrical properties of the pump motor, and to output the measured electrical properties as input signals. A controller detects when the hydraulic circuit is fully charged by determining an actual speed of the pump motor. The controller calculates an average pump torque and a slope of the average pump torque for the pump motor using the input signals. A flag is set via the controller indicating that a calibrated line pressure has been attained in the hydraulic circuit when the slope of the average pump torque reaches zero and the speed of the pump motor reaches a calibrated speed.

Abstract: A power transmission device that transmits power from a motor to a wheel via a hydraulically driven friction engagement element and that includes a mechanical pump driven by the motor to produce a hydraulic pressure that is regulated by a pressure regulating valve; an electric pump that produces a hydraulic pressure; a switching mechanism that either switches an output pressure of the regulating valve or an output pressure of the electric pump to a servo of the engagement element based upon a signal pressure; a passage to supply pressure from the mechanical pump to the hydraulic servo; a check valve in the passage that allows supply of the pressure from the mechanical pump to the hydraulic servo and prohibits supply of the pressure from the electric pump to the mechanical pump, and the switching mechanism either shuts off or allows communication through the passage based upon the signal pressure.

Abstract: A hydraulic motor includes a motor mechanism that rotates by hydraulic liquid pressure led from a hydraulic liquid pressure source. The hydraulic motor includes a casing that defines a casing chamber which accommodates the motor mechanism, a brake mechanism that brakes the rotation of the motor mechanism, a brake release actuator that releases the braking of the brake mechanism by a brake release pressure led from the hydraulic liquid pressure source, and a throttle passage that is in communication with the casing chamber and extracts a portion of hydraulic liquid that is led into the brake release actuator and leads it to the casing chamber.

Abstract: A system including a fuel-supply system including, an auxiliary-fuel-gas compressor configured to compress a fuel for use by a gas-turbine system, an expander configured to generate power by expanding an oxidant from the gas-turbine system, and a motor/generator configured to function in a motor mode and in a generator mode, wherein the motor/generator drives fuel compression with the auxiliary fuel-gas compressor in the motor mode, and the motor/generator generates power in the generator mode as the expander uses oxidant from the gas-turbine system to drive the motor/generator

Abstract: When an excitation of a servo motor is released due to an emergency stop, a power outage, or another operation performed on a positioning device, the positioning device uses air supplied from an air supply source to vary pressure of an air balance, which cancels a self-weight of a vertical axis driven by the servo motor, thereby moving the vertical axis.

Abstract: A swing system for construction machinery or a vehicle, particularly an excavator or a crane, includes a swing brake for blocking or unblocking a rotational movement of a first portion of the vehicle relative to a chassis portion of the vehicle, and a swing pump and a swing motor are provided for performing the rotational movement. The swing pump can be positioned in a neutral position where no rotational movement of the first portion takes place. At least one brake control actuator is provided for automatically engaging the brake when the swing pump is in its neutral position. The swing system can provide an improved control of the swing movement on a slope and an improved comfort during operation of the swing movement.

Abstract: A torque converter hydraulic control subsystem for a transmission is provided. The torque converter hydraulic control subsystem includes a source of pressurized hydraulic fluid that communicates with a torque converter clutch (TCC) regulation valve, a TCC control valve, and a lubrication boost valve. The torque converter hydraulic control subsystem is configured to provide cooling and lubrication fluid flow to a torque converter in all modes of operation.

Abstract: A hydrostatic piston engine includes an actuating element configured to actuate a brake device to produce a braking force on a rotor of the piston engine. The actuating element is configured to release the brake device when a hydraulic force acts on the actuating element. The hydraulic force prevails in a pressure chamber which is connected to a pressure medium source via a first throttle point. The pressure chamber is also configured to be connected to a pressure medium sink. The hydrostatic piston engine also includes a pressure retention valve device configured to open in a direction of the pressure medium sink. The pressure retention valve device is disposed between the pressure chamber and the pressure medium sink. The opening pressure of the pressure retention valve device is at least equal to the pressure in the pressure chamber which is necessary to release the brake device.

Abstract: A hydraulic system including an accumulator and a hydraulic transformer is disclosed. The hydraulic transformer includes first and second variable displacement pump/motor units mounted on a rotatable shaft. The rotatable shaft has an end adapted for connection to an external load. The first variable displacement pump/motor unit includes a first side that fluidly connects to a pump and a second side that fluidly connects to a tank. The second variable displacement pump/motor unit includes a first side that fluidly connects to the accumulator and a second side that fluidly connects with the tank.

Abstract: A method of braking a hydrostatic drive machine includes steps of reducing a displacement of a pump of a hydrostatic drive system to a non-zero displacement, and increasing a displacement of a motor of the hydrostatic drive system to a displacement that is less than a maximum displacement. The method also includes a step of accelerating an engine of the hydrostatic drive system toward a desired engine speed range.

Abstract: A system for delivering a supply fluid stream to a fuel cell stack that discharges an unused fluid stream is provided. A fuel supply is adapted to provide a pressurized supply fluid stream. An expander is in fluid communication with the fuel supply and is configured to receive the pressurized supply fluid stream to reduce the pressure of the pressurized supply fluid stream and to generate mechanical energy in response to reducing the pressure of the pressurized supply fluid stream. An electric machine is operably coupled to the expander and for selectively converting the mechanical energy generated by the expander into electrical energy. A compressor/blower is capable of being driven by at least one of the mechanical energy and the electrical energy to control the flow of the unused fluid stream to the fuel cell stack for recirculating the unused fluid stream back to the fuel cell stack.

Abstract: A hydraulic control device includes an oil pump for generating a hydraulic pressure by being rotated by power of a driving force source, a driving force source stopping unit that stops rotation of the driving force source when a predetermined condition holds, and a cut-off unit that cuts off transmission of the power from the driving force source to the oil pump when the driving force source rotates in a reverse direction as the rotation of the driving force source is stopped by the driving force source stopping unit.

Abstract: Embodiments of the present invention are generally related to methods and devices for use with vehicles that include a clutch, a transmission, a slave cylinder, a master cylinder and an engine. In accordance with an embodiment, a device includes a primary piston configured to urge hydraulic fluid into a slave cylinder, when the primary piston is moved from a first position to a second position, to thereby disengage the clutch from the transmission. The primary piston is normally movable from the first position to the second position by hydraulic actuation of a master cylinder. A secondary piston is configured to selectively apply force to the primary piston, to move the primary piston from the first position to the second position, when the secondary piston is selectively actuated. The secondary piston can be selectively actuated by a secondary fluid, such as a compressed gas.

Abstract: A swing system for construction machinery or a vehicle, particularly an excavator or a crane, includes a swing brake for blocking or unblocking a rotational movement of a first portion of the vehicle relative to a chassis portion of the vehicle, and a swing pump and a swing motor are provided for performing the rotational movement. The swing pump can be positioned in a neutral position where no rotational movement of the first portion takes place. At least one brake control actuator is provided for automatically engaging the brake when the swing pump is in its neutral position. The swing system can provide an improved control of the swing movement on a slope and an improved comfort during operation of the swing movement.

Abstract: A hydrostatically driven vehicle has an engine operating a variable displacement propel pump, a displacement of which can vary based on an angle of a rotating swashplate, such that a fluid flow impelled by the pump transfers power to at least one propel motor rotating a wheel of the vehicle. An electronic controller of the vehicle senses an operating parameter of the system, for example, the angle of the rotating swashplate or the direction and speed of rotation of the propel motor with a sensor to yield an actual signal, and relays the actual signal to an electronic controller. The controller determines a desired angle for the rotating swashplate based on the control signal, and compares it to the actual signal from the sensor. Motion of the vehicle is stalled when the angle signal differs from the desired angle by a predetermined extent and for a predetermined period.

Abstract: A variator torque control system adjusts a variator output so that the actual output torque of the variator closely matches an expected output torque. In an example, pressure values of an existing torque control map are supplemented in real time with calculated pressure supplement values based on the current operation of the variator. The pressure supplement value for each mapped pressure value may be derived based on a prior application of the same or another map value.

Abstract: A transmission comprises a casing, an output element, a hydrostatic stepless transmission unit (HST) and a forward/backward traveling direction selecting unit (reverser). The output element is supported by the casing. The HST is disposed in the casing so as to be driven by a drive source disposed outside of the casing. The HST includes a pump shaft and a motor shaft member. The pump shaft is drivingly connected to the drive source. The motor shaft member is fitted around the pump shaft coaxially to the pump shaft so as to be rotatable relative to the pump shaft, thereby constituting a hydraulic pump and a hydraulic motor centered on the pump shaft and the motor shaft member. An axially distal end of the motor shaft member is disposed on the axially proximal side of an axially distal end of the pump shaft so that axial ends of the pump shaft are the axially most distal ends of the HST in the axial direction of the pump shaft.

Abstract: A hydraulic motor system for improved frequency response includes a hydraulic variator having a pump and a motor, wherein the pump includes a variable angle swash plate, and the system further includes an electric actuator for controlling an angle or torque of the swash plate, thereby controlling the motor output characteristics. The electric actuator for controlling the variable angle swash plate may comprise a linear electric motor, ball screw drive or a rotary electric motor. In an example, the rotary electric motor tilts the swash plate by applying a torque to the swash plate at a point away from its tilt axis. In a further example, the rotary electric motor tilts the swash plate via a worm drive or ball screw drive.

Abstract: A hybrid system for a machine is disclosed. The system has a pump configured to generate fluid flow within a hydraulic system and a first actuator actuated by fluid pressurized by the pump. The system also has a first motor configured to be selectively actuated by pressurized fluid directed from the first actuator by an external load and directed to the first motor by a first control valve. The system further has a first generator configured to be actuated by the first motor and a power source configured to actuate the pump. The system also has a powertrain including a first driveshaft and at least one traction device, the powertrain configured to transfer kinetic energy from the traction device to the first driveshaft during deceleration of the machine. The system further has a second generator configured to be selectively actuated by the kinetic energy transferred by the powertrain.

Abstract: A system for delivering a supply fluid stream to a fuel cell stack that discharges an unused fluid stream is provided. A fuel supply is adapted to provide a pressurized supply fluid stream. An expander is in fluid communication with the fuel supply and is configured to receive the pressurized supply fluid stream to reduce the pressure of the pressurized supply fluid stream and to generate mechanical energy in response to reducing the pressure of the pressurized supply fluid stream. An electric machine is operably coupled to the expander and for selectively converting the mechanical energy generated by the expander into electrical energy. A compressor/blower is capable of being driven by at least one of the mechanical energy and the electrical energy to control the flow of the unused fluid stream to the fuel cell stack for recirculating the unused fluid stream back to the fuel cell stack.

Abstract: A control arm is coupled to a control shaft of a hydraulic pump. A friction shaft extends parallel to the control shaft and is slidably moveable within an arcuate-shaped hole in the control arm. A stop plate is movably supported by the control shaft and the friction shaft. When the stop plate is in the operating position, a friction pad supported by the friction shaft is biased by a pressure plate and a spring against the control arm. When the stop plate is in the braking position, a sloping region of the stop plate engages a pin extending from the pressure plate such that the friction pad is spaced from the control arm and arcuate-shaped grooves in the stop plate engage pins extending from the control arm in a neutral position. The present invention also includes a hydrostatic transmission and a vehicle incorporating the cruise control and neutral return mechanism.

Abstract: A method of operating a brake system for a hydraulic motor, by feeding the hydraulic motor with at least one pump having a variable cubic capacity, in a closed circuit, providing a friction brake to brake the motor, providing a brake controller that controls an amount of applied frictional braking by the friction brake and an amount of applied hydraulic braking, and determining a level of actuation of the brake controller to detect normal and emergency braking situations. In normal braking situations, the proportional amount of frictional and hydraulic braking is managed as a function of parameters to cause progressive hydrostatic braking to occur by causing a ratio between the fluid flow rate delivered by the pump and the active cubic capacity of the motor to decrease progressively. In emergency braking situations there is a controlled sudden decrease in the ratio between the fluid flow rate delivered by the pump and the active cubic capacity of the motor, and then progressive hydrostatic braking occurs.

Abstract: In order to provide a construction machine by which energy regeneration can be performed reliably and battery and electrical power generator can be miniaturized, a construction machine has an engine, a hydraulic pump driven by the engine, and an actuator driven by discharge oil from the hydraulic pump, and a regenerative motor which rotates by return oil from the actuator is connected to the rotation shaft of the hydraulic pump. The hydraulic pump is driven by the engine and the regenerative motor when drive torque necessary in the hydraulic pump is larger than output torque generated by operation of the regenerative motor.

Abstract: Hydraulic motor drive apparatus having a cubic capacity selector (16) which has at least two positions, control means for controlling the selector, which means comprise a hydraulic control chamber (18) suitable for being fed with fluid via a control duct (20), and first opposing return means (17). The apparatus further comprises a brake system having a brake release chamber (38) and second opposing return means (39). The control duct (20) is suitable for being connected to the brake release chamber (38), and the first return means (17) are suitable for returning the cubic capacity selector to its large cubic capacity first position when the pressure in said chamber becomes lower than a first threshold pressure, whereas the second return means (39) return the brake means (36) to their braking position when the pressure in the brake release chamber becomes lower than a second threshold pressure, which is itself lower than said first threshold pressure.

Abstract: A control system for a vehicle having a hydraulic drive device such as a hydrostatic transmission or integrated hydrostatic transaxle with a return to neutral feature and a brake mechanism. The system includes a pair of linkages connected to the vehicle brake pedal; one is engaged to the return to neutral arm and the other is engaged to the brake of the drive device, so that actuation of the vehicle brake pedal first causes the return to neutral feature of the drive device to engage to reduce vehicle speed and eventually to return the device to the neutral position. As the vehicle brake pedal is further actuated, the brake mechanism of the drive device is also engaged.

Abstract: A hydrostatic transmission may be placed in a free-wheeling state by rotating a bypass actuator that lifts the motor from a motor running surface whereby hydraulic fluid flows into a transmission cavity. A bypass arm connected to the bypass actuator and to a bypass rod may be used to engage and disengage the bypass actuator via operation of the rod. Further, a bypass latch may be used to lock the bypass arm in an engaged position whereby the bypass actuator is engaged and the transmission is disengaged. The bypass latch arm is preferably linked to the brake pedal whereby actuation of the brake pedal disengages the bypass actuator through operation of the latching arm. The system may be designed to provide dynamic braking through transmission resistivity prior to application of a brake force to the axles or wheels by unlatching the bypass arm prior to actuating the brake arm.

Abstract: A turbine tool design with a number of innovative aspects which may be incorporated into the tool individually or as a group. One aspect relates to improved speed control, based on an elastically deformable governor member disposed within the rotating impeller assembly and having a substantially uniform cross-section. Another aspect relates to a overspeed safety configuration that employs secondary, or “retro”, nozzles that are enabled when the elastically deformable governor member is removed from the impeller assembly. Another aspect relates to routing the motive fluid exhaust through the operator-adjustable throttle assembly. Still another aspect relates to an approach to axially preloading the bearings supporting the rotating shaft of the impeller assembly.

Abstract: A hydraulic circuit for the hydrostatic transmission of a vehicle, said hydraulic circuit comprising at least one hydraulic motor, two main ducts, a parking brake having brake means, brake release control means suitable for feeding the brake release chamber from a first brake release fluid source, and means for connecting said chamber to a unpressurized reservoir. The circuit has a single short-circuit and selection valve having two main ports connected to respective ones of the two main ducts, and two selection ports connected respectively to the brake release chamber and to the brake release duct, and control means for controlling said valve, which control means are suitable for causing the valve to take up a first configuration in which the main ports are mutually isolated while the selection ports are interconnected, and for causing it to take up a second configuration in which the main ports are interconnected while the selection ports are mutually isolated.

Abstract: A hydrostatic transmission may be placed in a free-wheeling state by rotating a bypass actuator that lifts the motor from a motor running surface whereby hydraulic fluid flows into a transmission cavity. A bypass arm connected to the bypass actuator and to a bypass rod may be used to engage and disengage the bypass actuator via operation of the rod. Further, a bypass latch may be used to lock the bypass arm in an engaged position whereby the bypass actuator is engaged and the transmission is disengaged. The bypass latch arm is preferably linked to the brake pedal whereby actuation of the brake pedal disengages the bypass actuator through operation of the latching arm. The system may be designed to provide dynamic braking through transmission resistivity prior to application of a brake force to the axles or wheels by unlatching the bypass arm prior to actuating the brake arm.

Abstract: In order to reduce the shock that occurs in downshifting and up-shifting a hydraulic radial piston engine, a valve (1), which controls the displacement of the radial piston engine, is reversed with throttling. In order to prevent the throttled reversal from being affected by the level of pressure in the hydraulic fluid intake (3) to the hydraulic radial piston engine, a sealing point is provided in the valve (1), which controls the hydraulic fluid intake (3) to the torque-generating pistons. To prevent critical safety situations from arising, a valve (24) is positioned in front of the valve (1) that controls the displacement of the hydraulic radial piston engine; this valve (24) always switches the valve (1) that controls the displacement of the hydraulic radial piston engine, without pressure, when the hydraulic fluid intake (3) from a hydraulic fluid source to the hydraulic radial piston engine falls below a certain pressure level.

Abstract: In a direct drive type hydraulic pump, the displacement of the hydraulic pump is forcedly changed to a desired displacement according to an instruction of a channel different from a usual instruction, thereby changing to a desired displacement quickly with good responsivity. When an emergency brake switch is turned on, an emergency brake signal is entered an emergency brake control valve. Thus, an emergency brake signal pressure is entered a piston through an emergency brake signal oil passage, and a piston is forcedly positioned in a neutral position. In other words, the piston can be forcedly positioned in the neutral position according to the emergency brake signal regardless of the entry of a usual brake signal. Therefore, the displacement of the hydraulic pump can be forcedly changed to the neutral position (minimum displacement).

Abstract: A braking system (S) for braking a rotor (5, 9, 106) relative to a stator (1C, 1′C), said system comprising two series of brake disks (102, 104) secured respectively to the stator and to the rotor and disposed in a disk enclosure (100). The system further comprises a brake piston device (108, 114, 116) urged continuously in the braking direction by resilient return means (118). The piston device is urged in the brake release direction by feeding a brake release chamber (120) with fluid, and it is urged in the braking direction by feeding a braking chamber (124) with fluid. The braking system includes a cooling device for cooling the brake disks (102, 104) by means of fluid flow, which device is provided with a cooling duct (140) branching from the brake release duct (122) which feeds the brake release chamber (120) and communicating with the disk enclosure (100). It is provided with means (148) for limiting the quantity of cooling fluid tapped by the cooling duct (140) from the brake release duct (122).

Abstract: A neutral brake system for use in a hydrostatic transmission to automatically apply a brake when the hydrostatic transmission is shifted to neutral. The neutral brake system includes a hydraulically-released, spring-activated brake mechanism in direct fluid communication with the main hydraulic passages which form a hydraulic circuit between the pump and the motor. When the hydrostatic transmission is shifted to neutral, a brake spring biases a brake lever into contact with a pair of friction pads to engage a brake disk splined to the output shaft of the motor to stop the vehicle. When the hydrostatic transmission is shifted out of neutral, a charge of hydraulic pressure within the hydraulic circuit causes a piston within a brake release chamber to override the biasing force of the brake spring, and to urge the brake lever out of contact with the friction pads such that the friction pads are disengaged from the brake disk, and the output shaft of the output shaft of the motor may freely rotate.

Abstract: A hydraulic pilot control system having two control outputs to which a control pressure can be applied and having a hydraulic pilot controller, which has a handle which can be pivoted from a neutral position in a first direction and in a second direction, and a pressure valve that can be displaced from the neutral position by the deflection of the handle. During pivoting of the handle in the first direction and during pivoting of the handle in the second direction, the pressure valve can be adjusted with the same effect, and wherein there is a directional control valve which, depending on the pivoting direction of the handle, connects a control output of the pressure valve to the first control output or to the second control output, whereby a behavior of the pilot control pressure which is symmetrical with respect to the deflection of the control lever in the two directions is adjustable in a simple way.

Abstract: There is disclosed an inching braking system wherein a brake piston of a brake valve assembly initiates an actuation movement of the brake piston by way of an actuator only after a predetermined stroke of a driving member for an inching piston.

Abstract: An engine crankshaft 2 and a wheel drive shaft 5 are connected through a static hydraulic infinitely variable transmission 3. The static hydraulic infinitely variable transmission 3 has a hydraulic pump 20 extending to an engine side of the transmission and a hydraulic motor 21 extending to a wheel drive shaft 5 side of the transmission and connected together using a closed hydraulic circuit. A control clutch 18 is fitted in the transmission system between the hydraulic motor 21 and the wheel drive shaft 5 so that the control clutch is disengaged when the engine is idling and when operation is suspended.

Abstract: A hydrostatic transmission may be placed in a free-wheeling state by rotating a bypass actuator that lifts the motor from a motor running surface whereby hydraulic fluid flows into a transmission cavity. A bypass arm connected to the bypass actuator and to a bypass rod may be used to engage and disengage the bypass actuator via operation of the rod. Further, a bypass latch may be used to lock the bypass arm in an engaged position whereby the bypass actuator is engaged and the transmission is disengaged. The bypass latch arm is preferably linked to the brake pedal whereby actuation of the brake pedal disengages the bypass actuator through operation of the latching arm. The system may be designed to provide dynamic braking through transmission resistivity prior to application of a brake force to the axles or wheels by unlatching the bypass arm prior to actuating the brake arm.

Abstract: A hydraulic door opener provides a simplified mechanism for two-speed operation and for controlling the release of a brake that normally holds the door against movement. The mechanism includes a bypass valve between a fluid reservoir feeding the pump and the close control line running between the pump and the hydraulic motor. Fluid flow is directed from the close control line so that the door can be closed at slower rate than it is opened using a single speed motor. A brake control valve releases the brake when the control lines are pressurized.

Abstract: An apparatus, for controlling a plurality of hydraulic motors and a clutch for driving a drive shaft, can prevent a speed change shock and a load slip of a hydraulic motor as well as making a structure simple. The apparatus includes: a first volume variable hydraulic motor (1), connected to the drive shaft (3) through the clutch (5); a second volume variable hydraulic motor (2), which is always connected to the drive shaft (3); first tilt rotation control means (7, 8), for controlling a tilt rotation amount (a discharge volume cc/rev) of the first hydraulic motor by receiving a drive side pressurized oil (Pac) of the first hydraulic motor; and a zero tilt rotation holding means (10, 10A), for holding the tilt rotation amount of the first hydraulic motor at substantially zero in a state wherein the tilt rotation amount of the first hydraulic motor is controlled to be substantially zero.

Abstract: A hydraulic continuously variable transmission for use on a vehicle comprises a hydraulic variable pump, which is driven by an engine, and a hydraulic variable motor, which is driven by oil discharged from the hydraulic variable pump to drive wheels. In addition, this transmission includes shift position detecting means, which detects a shift position, and vehicle stop detecting means, which detects whether the vehicle is in halt. In this transmission, when the vehicle stop detecting means detects that the vehicle is in halt and the shift position detecting means detects that the shift position is in a forward or rearward drive position, the discharge capacity of the hydraulic variable motor is set to a maximum, and the discharge capacity of the hydraulic variable pump is controlled to a predetermined capacity (first predetermined capacity) in correspondence with the shift position. Thereby, the vehicle is prevented from relapse phenomenon, i.e.

Abstract: A braking apparatus includes a brake cylinder having a first brake opening and a second brake opening defined therein. The first brake opening is adapted to allow a flow of brake fluid to enter the brake cylinder and the second brake opening is adapted to allow the flow of brake fluid to exit the brake cylinder. The braking apparatus also includes a first transmission opening and a second transmission opening defined in the brake cylinder. The first transmission opening is adapted to allow a flow of transmission fluid to enter the brake cylinder and the second transmission opening is adapted to allow the flow of transmission fluid to exit the brake cylinder. The braking apparatus further includes a movable member located within the brake cylinder.

Abstract: A hydraulic continuously variable transmission for use on a vehicle comprises a hydraulic closed circuit, first and second pressure controlling means, brake operation detecting means and deceleration detecting means. The hydraulic closed circuit includes a hydraulic pump, a hydraulic motor, a first oil passage connecting a port of the hydraulic pump with a port of the hydraulic motor and a second oil passage connecting another port of the hydraulic pump with another port of the hydraulic motor, and first and second pressure controlling means control the pressures of the first and second oil passages, respectively. If the deceleration of the vehicle is greater than a standard deceleration when the operation of the brake is detected, then the pressure of the first or second oil passage whose pressure is higher than that of the other is lowered to a predetermined low pressure that is higher than the pressure of either oil passage which is lower by either the first or second pressure controlling means.