Abstract: A vibration assembly for a surface compactor machine includes a support subassembly connected to the compacting surface of the surface compactor machine. A primary eccentric shaft is disposed around a secondary eccentric shaft, with the primary and secondary eccentric shafts both rotatable about a common axis of rotation. One or more of primary bearing subassemblies is disposed between the primary eccentric shaft and the support subassembly for supporting the primary eccentric shaft during rotation of the primary eccentric shaft. One or more secondary bearing subassemblies is disposed between the secondary eccentric shaft and the primary eccentric shaft for supporting the secondary eccentric shaft during rotation of the primary eccentric shaft.

Abstract: Provided is a hydraulic circuit of construction equipment, including a boom cylinder for controlling ascending and descending movement of a boom, which includes a valve unit having a first control valve configured to control a large chamber of the boom cylinder to selectively communicate with a small chamber of the boom cylinder, a second control valve configured to control the large chamber to selectively communicate with an oil tank, a third control valve configured to control the large chamber to selectively communicate with an accumulator, and a fourth control valve configured to control a part of hydraulic oil flowing to the accumulator to selectively flow to an assist motor.

Abstract: A flow control valve includes a valve body having an inner circumferential surface defining a longitudinal bore to which first and second fluid passages are connected. A spool is slidably inserted into the bore to allow a flow of fluid from the first to second fluid passage. A valve regulates a flow rate of fluid flowing through the first fluid passage. A first seat surface is defined between an area in which the first fluid passage is connected to the bore and an area in which the second fluid passage is connected to the bore. When the flow of fluid from the first to second fluid passage is initiated, an area of a gap between the first seat surface and the spool on a plane taken in a transverse direction is 5%˜50%, preferably 10%˜20% of an area of an opening defined by the first seat surface.

Abstract: A surface compactor machine includes a compacting surface for compacting a substrate, a first motor, a second motor, a support assembly, and a controller. The first motor rotates a first eccentric shaft. The second motor rotates a second eccentric shaft. The support assembly is connected to the first and second eccentric shafts to transfer vibration forces to the compacting surface. The controller controls speed of at least one of the first and second motors so that a rotational speed of the second eccentric shaft is an integer, greater than 1, times faster than a rotational speed of the first eccentric shaft to generate a composite displacement waveform that vibrates the compacting surface upwards and downwards, wherein the composite displacement waveform includes a zero amplitude coordinate, a wave section located above the zero amplitude coordinate, and a wave section located below the zero amplitude coordinate that is asymmetric relative to the wave section located above the zero amplitude coordinate.

Abstract: A hybrid system for a vehicle including a hybrid machine and a transmission arrangement that includes a first, a second and a third planetary gear set each including a sun gear, a planet carrier and a ring gear, the transmission arrangement further including five shift elements engageable in combinations of two to obtain six forward gear stages, wherein the ring gear of the first planetary gear set and the planet carrier of the second planetary gear set are operatively connected to each other, the ring gear of the second planetary gear set and the planet carrier of the third planetary gear set are operatively connected to each other, two planetary members of the third planetary gear set are selectively connectable to each other by a single one of the shift elements, wherein the hybrid machine and the ring gear of the first planetary gear set are connected to each other.

Abstract: A post for a cab of a vehicle includes an elongated tubular element presenting a tubular element cavity extending longitudinally within the post and an elongated reinforcement element extending in the longitudinal direction of the tubular element along a part of the tubular element, and including a base end and a free end. A tapered portion of the reinforcement element includes the free end thereof being located in the tubular element cavity and tapered in the direction from the base end towards the free end. A base portion of the reinforcement element is at least partly located in the tubular element cavity and extends from the tapered portion to the base end. The reinforcement element presents a smooth transition between the tapered portion and the base portion.

Abstract: A paver machine includes a screed arranged to level out road material disposed on the ground and a pressure actuated screed lifting cylinder arranged to lift and lower the screed with respect to the ground. A pressure sensor is arranged to measure the pressure in the cylinder when the screed is being lifted or lowered. Further a control unit configured to receive pressure data from the pressure sensor indicative of the pressure in the screed lifting cylinder when the screed is being lifted by the screed lifting cylinder. Based on analysing the pressure data, the control unit sets a reference height position for the screed.

Abstract: A method is provided for alerting a person near a vehicle when said vehicle performs a movement. The vehicle is equipped with at least two speakers configured to emit sound alarms in opposite directions and each speaker that is oriented in the direction of the movement emits a first sound alarm, while each other speaker emits no sound or a second sound alarm that is different from the first sound alarm.

Abstract: According to an embodiment of the present invention, there is provided a method of diagnosing an abnormal state of a valve including: applying a current having a predetermined intensity to a valve; estimating a resistance value of the valve on the basis of an intensity of a feedback current from the valve according to the application of the current and a voltage between both terminals of the valve; and when a difference between a resistance value of the valve estimated at a first time point and a resistance value of the valve estimated at a second time point is greater than or equal to a threshold, determining that abnormality has occurred in the valve.

Abstract: The invention relates to a working machine comprising a working machine frame, at least one propulsion axle having an elongated main body comprising a first end portion, a second end portion and a center portion arranged between the first and second end portions. The elongated main body has a main body length (MBL) extending from the first end portion to the second end portion. The working machine further comprises a propulsion axle suspension arrangement arranged between the working machine frame and the propulsion axle, the propulsion axle suspension arrangement comprising a first suspension device and a second suspension device arranged on opposite sides of a center of the elongated main body. The first and second suspension devices are arranged in the center portion of the elongated main body.

Abstract: A screed arrangement for a paver machine includes a screed body including a deflector member and a base plate, and an oscillating tamper bar arrangement positioned between the deflector member and the base plate. The screed arrangement further includes a connecting element connecting the oscillating tamper bar arrangement and the screed body to each other.

Abstract: A method for determining a load in a working machine including a linkage to be connected to an implement includes determining pressure in a first hydraulic cylinder and pressure in a second hydraulic cylinder arranged to control the linkage and determining at least one link angle between at least two links in the linkage. The method further includes, for a selected linkage bearing, determining at least two perpendicular force components acting on the selected linkage bearing, based on the determined pressure in each of the first and second cylinders and the at least one link angle; and determining a load on the selected linkage bearing as a linear combination of the at least two perpendicular force components using predetermined constants for the linear combination.

Abstract: The invention relates to an engine air filter unit for a vehicle (1) that is designed to supply filtered air to an internal combustion engine of the vehicle (1). The engine air filter unit (10) comprises a main filter (14), a mounting base (15) to secure the engine air filter unit (10) on at least one body panel (7, 71, 72) of the vehicle, a pre-separator fluidically connected to the main filter. The main filter (14) is arranged on a side of the mounting base (15) and the pre-separator (18) is arranged on the opposite side of the mounting base (15). The pre-separator housing is at least partly formed by the mounting base (15) and an air duct (19) extends through the mounting base (15) to fluidically connect the pre-separator to the filtration chamber.

Abstract: The invention relates to a system for a work machine. The power system comprises a power-split continuously variable transmission for propulsion of the work machine and a hydraulic system for work hydraulics. The power-split continuously variable transmission has a hydrostatic branch and a mechanical branch. The hydrostatic branch comprises a first hydraulic machine and a second hydraulic machine. The hydrostatic branch comprises a first control valve fluidly connected to the first hydraulic machine and to the second hydraulic machine for controlling the flow of hydraulic fluid between the first hydraulic machine and the second hydraulic machine. The hydraulic system comprises at least one hydraulic actuator fluidly connected to a first port of the first hydraulic machine, and a second control valve for controlling the flow of hydraulic fluid to said at least one hydraulic actuator.

Abstract: An asphalt density estimation system includes a measurement device configured to output a measurement signal; a time synchronization unit configured to sample the measurement signal to obtain a sampled measurement signal and identify periodic sampling points of the sampled measurement signal across a plurality of periods. The system also includes a time synchronous averaging unit configured to construct a modified measurement signal in the time domain by: for at least one sampling point within the period, averaging a plurality of the periodic sampling points across periods to obtain an average periodic data point for the at least one sampling point, and constructing the modified measurement signal using the average periodic data point for the at least one sampling point. The system further includes a density calculation unit configured to determine asphalt density values based on the modified measurement signal; and a display unit configured to display the determined asphalt density values.

Abstract: Provided is a device for controlling a working unit of construction equipment which comprises a hydraulic control device configured to hydraulically control a working unit and operated by an operating lever, a plurality of sub-electronic control units (ECU) electrically connected with the hydraulic control device, a main ECU configured to receive information on states of the hydraulic control device and the plurality of sub-ECUs, a relay configured to apply or cut off electric power to the plurality of sub-ECUs by a signal generated from the main ECU, and an emergency mode switch configured to turn an emergency mode on/off, wherein, when the emergency mode switch is turned on, the relay to which electric power is cut off according to a main ECU's failure diagnosis signal applies or cuts off electric power to the plurality of sub-ECUs by movement of the operating lever.

Abstract: An eccentric assembly for a compaction machine may include an outer eccentric mass and first and second inner eccentric masses. A length of the outer eccentric mass is in a direction of an axis of rotation of the outer eccentric mass. The first inner eccentric mass is rotatably connected to the outer eccentric mass by a first joint, and the second inner eccentric mass is rotatably connected to the outer eccentric mass by a second joint. Moreover, the first and second inner eccentric masses are separate, and the first and second joints are separate. Related compaction machines are also discussed.

Abstract: A time-based power boost control system. A fluid source supplies fluid. A relief device relieves pressure of the fluid supplied by the fluid source when the pressure of the fluid exceeds a relief pressure level. A control device controls the relief device. When a boost mode in which at least a first level of pressure and a second level of pressure, higher than the first level of pressure, are allowed to be selectively used as the relief pressure level is active, a length of a boost-on time in which the second level of pressure is used as the relief pressure level is shorter than a preset maximum boost-on time limit, and a length of a succeeding boost-off time succeeding the boost-on time in which the first level of pressure is used as the relief pressure level is equal to or longer than a preset minimum boost-off time limit.

Abstract: A first required flow rate is calculated as a function of a first maximum allowable flow rate and a value of a first signal. A second required flow rate is calculated as a function of a value of the second signal. When the first maximum allowable flow rate is higher than a first capacity, the value of the first signal is a maximum level, and the value of the second signal is equal to or higher than a minimum level and equal to or lower than a maximum level, a first working fluid supply is controlled to discharge working fluid at a flow rate equal to the first capacity, and a second working fluid supply is controlled to discharge working fluid at a flow rate obtained by deducting the first capacity from the first maximum allowable flow rate, added to the second required flow rate.

Abstract: A hydraulic machine is provided. A first flow control valve directs fluid from a first fluid supply to a first actuator when the first flow control valve is in a first position. A conflux control valve directs fluid from the first fluid supply to a second flow control valve when the conflux control valve is in a conflux position. The second flow control valve directs fluid from a second fluid supply and the first fluid supply to a second actuator when second flow control valve is in a second position. A bypass path allows the first fluid supply to communicate with the conflux control valve by passing around the first flow control valve.