A hydraulic driving device of a suction car includes a HST circuit, a suction actuator, a supply channel and a switching valve. In the HST circuit, a first connection channel and a second connection channel connect between a traveling drive pump and a traveling motor in a closed circuit. The suction actuator suction drives a suction device by being actuated by a hydraulic pressure. The switching valve allows oil discharged from the traveling drive pump to the first connection channel to be supplied to the traveling motor in a first operation state. The switching valve allows oil discharged from the traveling drive pump to the first connection channel to flow into the supply channel and be supplied to the suction actuator in a second operation state.

A wheeled work vehicle (1) comprises a forward chassis part (4) and a rearward chassis part (5) pivotally connected about a substantially vertically extending primary pivot axis (7) for steering thereof. A pair of forward ground engaging wheels (29) are carried on a forward suspension unit (32), and a pair of rearward ground engaging wheels (30) are carried on a rearward suspension unit (33). The forward suspension unit (32) is pivotally connected to the forward chassis part (4) by a pair of main forward transverse pivot shafts (63) pivotally coupled to the forward chassis part (4) by corresponding main forward pivot mountings (65). The main forward transverse pivot shafts (63) defines a main forward transverse pivot axis (59) about which the forward suspension unit (32) is pivotal relative to the forward chassis part (4). The forward suspension unit (32) comprises a pair of spaced apart trailing arms (35) which are joined by a torsion shaft (68) of tubular steel, which is rigidly connected to the trailing arms (35). The torsion shaft (68) defines a torsional axis (70), and permits limited upward and downward pivotal type torsional deflection of the trailing arms (35) relative to each other. The rearward suspension unit (33) is substantially similar to the forward suspension unit (32) and is coupled to the rearward chassis part (5) about a pair of main rearward transverse pivot shafts (87) in a similar manner as the forward suspension unit (32) is coupled to the forward chassis part (4).

The purpose of the invention is to save fuel, which involves a significant reduction of polluting gases for exerting a force that can move a vehicle, by reducing the revolutions of the main motor or engine. For this purpose, the invention relates to a motor is connected to two transmissions associated with the propulsion means or front and rear wheels (11) of the vehicle, such that an output power shaft (4) of the main engine (1) is connected to a hydraulic variable-displacement piston pump (5) that is associated with a hydraulic Circuit (6) with means for selectively recirculating the fluid to a pair of hydraulic motors (8) associated with corresponding differentials (9) of rear and front traction means, such that it is possible to activate either propulsion system, both propulsion systems simultaneously or neither of them.

A method for controlling a vehicle including a main transmission and a hydraulic transmission, in which, in the absence of a setpoint on the brake, and when the hydraulic transmission is activated, a hydraulic pump of the hydraulic transmission is controlled in such a way as to establish a predetermined pressure inside a hydraulic circuit of the hydraulic transmission, and in the event of a setpoint applied to the brake, the hydraulic transmission is then controlled according to an acceleration setpoint applied to the vehicle. If the acceleration setpoint is greater than or equal to an acceleration threshold value, and the speed of travel of the vehicle is less than or equal to a speed threshold value, the hydraulic transmission is controlled in such a way as to apply a tractive force. If the acceleration setpoint is less than the first threshold value, the hydraulic transmission is disengaged.

A work vehicle includes: a vehicle body; a plurality of traveling devices located on both right and left sides of the vehicle body; a plurality of bending link mechanisms that support the respective traveling devices on the vehicle body such that the traveling devices can be individually raised or lowered; and a plurality of drive mechanisms capable of individually changing the posture of the bending link mechanisms. The drive mechanisms change the posture of the bending link mechanisms while maintaining a state in which intermediate bending portions of the bending link mechanisms bend toward an intermediate side in a front-rear direction of the vehicle body.

A work vehicle includes a plurality of traveling devices driven for traveling, a plurality of articulated link mechanisms having a plurality of links pivotally coupled to each other to provide two or more joints and configured to independently support the traveling devices to a vehicle body with allowing lifting/lowering of the traveling devices independently relative to the vehicle body, and a plurality of hydraulic cylinders capable of changing respective postures of the plurality of links included in the articulated link mechanisms. A first link located at a position nearest the vehicle body is supported to be pivotable about a body side coupling portion. A first hydraulic cylinder for operating the first link has its cylinder tube side pivotally coupled to a coupled portion on the side of the vehicle body and has its piston rod side pivotally coupled to a coupled portion on the side of the first link.

In a self-propelled construction machine (1), in particular road milling machine, comprising a machine frame (8), at least three travelling devices (12, 16), wherein at least one of the three travelling devices (12, 16) is realized as a pivotable travelling device (16) so that said travelling device (16) is pivotable about at least one vertical pivoting axis in relation to the machine frame (8) between a first pivoted-in and at least one second pivoted-out position, at least one working device (20), in particular a milling drum, for working the ground pavement (3), at least one hydraulic drive system (70) for driving at least two travelling devices (12, 16), wherein at least one of the at least two driven travelling devices is the pivotable travelling device (16), wherein the hydraulic drive system (70) comprises at least one hydraulic pump (78), it is provided for the following features to be achieved: the hydraulic drive system (70) comprises one each hydraulic variable displacement motor (72) for driving the driven travelling devices (12) with the exception of the at least one pivotable travelling device (16), wherein the hydraulic drive system (70) comprises a hydraulic fixed displacement motor (74) for driving the at least one pivotable travelling device (16).

The invention relates to a self-propelled construction machine, in particular a road milling machine, stabiliser, recycler or surface miner, which has a machine frame 2 supported by at least three running gears 10A, 10B, 11A, 11B, a drive device 14 for driving at least two running gears, and a work roller 4 arranged on the machine frame. The invention also relates to a method for controlling a construction machine of this kind. The drive device 14 comprises adjustable hydraulic motors 15, 16, 17, 18 associated with the drivable running gears, which hydraulic motors have a displacement volume Vg that can be varied by an adjusting device 15A, 16A, 17A, 18A, and comprises at least one adjustable travel drive-hydraulic pump 19 driven by at least one drive motor to supply the hydraulic motors with a variable total volume flow Q of hydraulic fluid. In addition, a controller 28 is provided which is configured in such a way that a partial volume flow Q.sub.1, Q.sub.2, Q.sub.3, Q.sub.4 is determined for each adjustable hydraulic motor 15, 16, 17, 18 from the total volume flow Q provided by the at least one travel drive-hydraulic pump 19, by means of which partial volume flow the particular hydraulic motor is to be operated, and when the speed n of an adjustable hydraulic motor increases as a result of slippage of the running gear associated with the adjustable hydraulic motor, the adjusting device of the adjustable hydraulic motor is controlled in such a way that a displacement volume Vg is set for the adjustable hydraulic motor, at which displacement volume the partial volume flow determined for the adjustable hydraulic motor is maintained. The self-propelled construction machine according to the invention is characterised in that a hydraulic flow divider is not required.

A device for moving trailers (the device) enables anyone to easily maneuver and guide and park precisely in a specific location a trailer such as camper, utility, boat, horse or any other type of a tow behind a vehicle trailer without being attached to a vehicle. The device allows anyone to drive a parked trailer from its parked location to the towing vehicle with precise alignment to the ball hitch of the towing vehicle. The device is self-powered for the purpose of lifting and or lowering the trailer hitch on or off the hitch ball of the towing vehicle and a hydraulic pump and reservoir and a pair hydraulic motors for the forward and reverse movement and the left and right steering. The device is controlled with a wireless hand held remote through a Bluetooth operation system and or a phone application, which can be downloaded onto your smart phone.

The invention relates to a tracked vehicle comprising a vehicle body and a track assembly pair. Said track assembly pair is arranged to suspendedly support said vehicle body allowing relative movement between said vehicle body and each track assembly (21) of said track assembly pair. Each track assembly (21) comprises a track support beam (22) configured to support a plurality of road wheels (23, 23a), a drive wheel (24), and a motor (110) for operating said drive wheel (24), an endless track (25) being disposed around said road wheels (23, 23a) and drive wheel (24). Said motor (110) is fixedly arranged to said track support beam (22). Said motor (110) is arranged in connection to the drive wheel (24) such that a motor axle essentially coaxially coincides with a centre axis (Z) of the drive wheel (24).