Abstract: A powertrain system for driving a vehicle comprises an engine, a transaxle including a hydraulic motor, a hydraulic pump separated from the hydraulic motor, and a gearbox joined to the hydraulic pump. The engine includes an engine output shaft extended in the lateral direction of the vehicle. The hydraulic pump and the hydraulic motor are fluidly connected to each other so as to constitute a hydrostatic transmission. The gearbox supports a PTO shaft. The gearbox incorporates gears for drivingly connecting the engine output shaft to the hydraulic pump, and for drivingly connecting the engine output shaft to the PTO shaft extended in the fore-and-aft direction of the vehicle.

Abstract: A clutch system includes a transmission shaft, a gear, and a clutch slider. The gear is provided on the transmission shaft rotatably relative to the transmission shaft. The clutch slider is provided on the transmission shaft axially slidably along the transmission shaft and unrotatably relative to the transmission shaft. The gear and the clutch slider are provided with respective clutch teeth. The clutch system is set in either a clutch-on state where the clutch teeth of the gear engage with the clutch teeth of the clutch slider or a clutch-off state where the clutch teeth of the gear disengage from the clutch teeth of the clutch slider. The clutch system is provided with a hydraulic control system to hydraulically control the respective axial slide actions of the clutch slider in a clutch-on direction for realizing the clutch-on state and in a clutch-off direction for realizing the clutch-off state.

Abstract: A riding lawnmower includes left and right wheels, at least one caster wheel, a lawnmower blade or reel, and a control section. The left and right wheels are independently driven by electric rotary machines to travel. The lawnmower blade or reel is driven for mowing. The control section, in response to turn instruction input by a turn operator, controls the left and right wheels according to preset standard setting conditions, or according to deceleration setting conditions which differ from the standard setting conditions, under which at least one of a vehicle movement speed and vehicle turning speed is decelerated more than under standard setting conditions. The riding lawnmower includes a section designating either standard setting conditions or deceleration setting conditions. In a riding lawnmower, left and right wheels are caused to turn around a turn center position corresponding to a turn instruction according to designated setting conditions.

Abstract: A hydrostatic stepless transmission (“HST”) includes a center casing into which a plunger block of a hydraulic pump and a plunger block of a hydraulic motor are inserted. Plunger ports are open and aligned peripherally on an outer peripheral surface of each plunger block. A pair of main fluid passages of a closed fluid circuit fluidly connecting the hydraulic pump to the hydraulic motor are formed in opposite side portions of the center casing. Each of the main fluid passage includes peripheral grooves formed on an inner peripheral surface of the center casing so as to face the plunger ports of the respective plunger blocks, and includes an axial fluid duct formed to be interposed between the peripheral grooves. A bearing gap is provided between the inner peripheral surface of the center casing and the outer peripheral surface of the plunger block so as to cause a dynamic pressure action of fluid.

Abstract: An HST control mechanism includes a rotary member, a servo unit, a telescopic member, and a biasing device. The rotary member for controlling a displacement of a hydrostatic transmission (HST) is pivoted outside of a casing incorporating the HST. The servo unit includes a telescopically movable actuator and a valve controlling the telescopic movement of the actuator. The actuator is interlockingly connected to the rotary member. The servo unit is pivotally supported on the casing via a first pivot. The servo unit rotates centered on the first pivot as the rotary member rotates according to the telescopic movement of the actuator hydraulically controlled by the valve. The telescopic member is pivotally supported on the casing via a second pivot. The telescopic member is provided with the biasing device that biases the telescopic member and the rotary member toward a position corresponding to a neutral state of the HST.

Abstract: A control system for an engineless, motor-driven lawnmower vehicle includes electric motors and controllers. At least one of the electric motors is an electric drive motor connected to a drive wheel of the lawnmower vehicle to enable transmission of motive power. At least one other electric motor is a mower-related electric motor connected to a lawnmower rotary tool to enable transmission of motive power. At least one of the controllers is a drive wheel controller which includes a drive wheel driver and which controls operation of the electric drive motor in response to a signal from at least one operator sensor for detecting an operation amount of at least one operator. At least one controller controls to activate or stop the mower-related electric motor. At least one controller is connected to the drive wheel controller and transmits a control signal thereto in response to a signal from the operator sensor.

Abstract: A transaxle is adaptable to a vehicle equipped with a longitudinal engine including an engine output shaft to be oriented in a longitudinal direction of a vehicle. The transaxle comprises a transmission output shaft to be oriented in a lateral direction of the vehicle so as to be drivingly connected to a drive wheel of the vehicle, a hydrostatic transmission and a mechanical transmission for transmitting power from the engine output shaft to the transmission output shaft, and first and second power take-off shafts for taking off power from the mechanical transmission. The engine is joined to the transaxle so that the engine, the hydrostatic transmission and the mechanical transmission are assembled together. The first and second power take-off shafts are distributed rightward and leftward from the engine.

Abstract: A powertrain system for driving a vehicle comprises an engine, a transaxle including a hydraulic motor, a hydraulic pump separated from the hydraulic motor, and a gearbox joined to the hydraulic pump. The engine includes an engine output shaft extended in the lateral direction of the vehicle. The hydraulic pump and the hydraulic motor are fluidly connected to each other so as to constitute a hydrostatic transmission. The gearbox supports a PTO shaft. The gearbox incorporates gears for drivingly connecting the engine output shaft to the hydraulic pump, and for drivingly connecting the engine output shaft to the PTO shaft extended in the fore-and-aft direction of the vehicle.

Abstract: A riding lawnmower includes left and right wheels, at least one caster wheel, a lawnmower blade or reel, and a control section. The left and right wheels are independently driven by electric rotary machines to travel. The lawnmower blade or reel is driven for mowing. The control section, in response to turn instruction input by a turn operator, controls the left and right wheels according to preset standard setting conditions, or according to deceleration setting conditions which differ from the standard setting conditions, under which at least one of a vehicle movement speed and vehicle turning speed is decelerated more than under standard setting conditions. The riding lawnmower includes a section designating either standard setting conditions or deceleration setting conditions. In a riding lawnmower, left and right wheels are caused to turn around a turn center position corresponding to a turn instruction according to designated setting conditions.

Abstract: A lawnmower vehicle which is a working vehicle with an electromagnetic brake includes left and right electromagnetic brakes, a brake relay which is a common brake releasing unit, and an ECU. The ECU compares electricity supply states of the left and right electromagnetic brakes, and controls the brake relay to disconnect an electrical connection between a battery and the left and right electromagnetic brakes, and to brake left and right wheels when a difference in the electricity supply states compared by a comparator exceeds an allowable upper limit.

Abstract: A control system for a lawnmower vehicle having a plurality of electric motors may include at least one controller for controlling operation of the drive wheel electric motor in response to an operation amount of at least one operator. The controller may control operation of a driver for driving a mower-related electric motor to cause the mower-related electric motor to activate or stop.

Abstract: A hydrostatic stepless transmission (“HST”) includes a center casing into which a plunger block of a hydraulic pump and a plunger block of a hydraulic motor are inserted. Plunger ports are open and aligned peripherally on an outer peripheral surface of each plunger block. A pair of main fluid passages of a closed fluid circuit fluidly connecting the hydraulic pump to the hydraulic motor are formed in opposite side portions of the center casing. Each of the main fluid passage includes peripheral grooves formed on an inner peripheral surface of the center casing so as to face the plunger ports of the respective plunger blocks, and includes an axial fluid duct formed to be interposed between the peripheral grooves. A bearing gap is provided between the inner peripheral surface of the center casing and the outer peripheral surface of the plunger block so as to cause a dynamic pressure action of fluid.

Abstract: A riding lawnmower includes left and right wheels, at least one caster wheel, a lawnmower blade or reel, and a control section. The left and right wheels are independently driven by electric rotary machines to travel. The lawnmower blade or reel is driven for mowing. The control section, in response to turn instruction input by a turn operator, controls the left and right wheels according to preset standard setting conditions, or according to deceleration setting conditions which differ from the standard setting conditions, under which at least one of a vehicle movement speed and vehicle turning speed is decelerated more than under standard setting conditions. The riding lawnmower includes a section designating either standard setting conditions or deceleration setting conditions. In a riding lawnmower, left and right wheels are caused to turn around a turn center position corresponding to a turn instruction according to designated setting conditions.

Abstract: A hydraulic actuator unit includes a first electric motor assembly formed by mounting one of a pair of electric motors to one of a pair of electric motor covers, wherein the first electric motor assembly is detachably mounted to a pump case so as to rotate a first control shaft around its axis line, and a second electric motor assembly formed by mounting the other one of the pair of electric motors to the other one of the pair of electric motor covers, wherein the second electric motor assembly is detachably mounted to the pump case so as to rotate a second control shaft around its axis line.

Abstract: A lawnmower vehicle which is a working vehicle with an electromagnetic brake includes left and right electromagnetic brakes, a brake relay which is a common brake releasing unit, and an ECU. The ECU compares electricity supply states of the left and right electromagnetic brakes, and controls the brake relay to disconnect an electrical connection between a battery and the left and right electromagnetic brakes, and to brake left and right wheels when a difference in the electricity supply states compared by a comparator exceeds an allowable upper limit.

Abstract: A control system for an engineless, motor-driven lawnmower vehicle includes electric motors and controllers. At least one of the electric motors is an electric drive motor connected to a drive wheel of the lawnmower vehicle to enable transmission of motive power. At least one other electric motor is a mower-related electric motor connected to a lawnmower rotary tool to enable transmission of motive power. At least one of the controllers is a drive wheel controller which includes a drive wheel driver and which controls operation of the electric drive motor in response to a signal from at least one operator sensor for detecting an operation amount of at least one operator. At least one controller controls to activate or stop the mower-related electric motor. At least one controller is connected to the drive wheel controller and transmits a control signal thereto in response to a signal from the operator sensor.

Abstract: A riding lawnmower vehicle includes two main drive wheels, at least one caster wheel, an electric traction motor, an internal combustion engine, a generator driven by the internal combustion engine, and a lawnmower. The electric energy generated by the generator can be supplied directly or via an electric accumulator to the electric traction motor. The main drive wheels are independently driven by the electric traction motor, which can operate as a traction power source. When viewed from one end to the other end in the width direction of the vehicle, the internal combustion engine and a secondary battery operable as the electric accumulator overlap each other, and the main drive wheels overlap at least a part of at least one of the internal combustion engine, the generator, the secondary battery, a fuel cell, a capacitor, an inverter, a cooling device, a mower driving motor, and a grass-collecting duct.

Abstract: A control system for a lawnmower vehicle having a plurality of electric motors may include at least one controller for controlling operation of the drive wheel electric motor in response to an operation amount of at least one operator. The controller may control operation of a driver for driving a mower-related electric motor to cause the mower-related electric motor to activate or stop.

Abstract: In the hydraulic actuator unit according to the present invention, a first electric motor assembly formed by mounting one of a pair of electric motors to one of a pair of electric motor covers is detachably mounted to a pump case so as to rotate a first control shaft around its axis line, and a second electric motor assembly formed by mounting the other one of the pair of electric motors to the other one of the pair of electric motor covers is detachably mounted to the pump case so as to rotate a second control shaft around its axis line.

Abstract: A riding lawnmower includes left and right wheels, at least one caster wheel, a lawnmower blade or reel, and a control section. The left and right wheels are independently driven by electric rotary machines to travel. The lawnmower blade or reel is driven for mowing. The control section, in response to turn instruction input by a turn operator, controls the left and right wheels according to preset standard setting conditions, or according to deceleration setting conditions which differ from the standard setting conditions, under which at least one of a vehicle movement speed and vehicle turning speed is decelerated more than under standard setting conditions. The riding lawnmower includes a section designating either standard setting conditions or deceleration setting conditions. In a riding lawnmower, left and right wheels are caused to turn around a turn center position corresponding to a turn instruction according to designated setting conditions.