895results about "Fluid steering" patented technology

An apparatus for operating a load-controlled hydraulic supply of an agricultural tractor includes a hydraulic pump which is adjustable with respect to the displacement volume for supplying pressurized hydraulic fluid, a proportional valve which is electrically actuatable, a primary hydraulic consumer to carry out a superordinate hydraulic function and to be directly connected to a conveying outlet of the hydraulic pump, a secondary hydraulic consumer to carry out a subordinate hydraulic function and to be connected to the conveying outlet of the hydraulic pump via the proportional valve, and a control unit configured to move the proportional valve into a closed valve position when the control unit recognizes that at least one of a required power of the primary and secondary hydraulic consumers exceeds the conveying capacity of the hydraulic pump and the subordinate hydraulic function of the secondary hydraulic consumer is inactive.

An auxiliary hydraulic system including an accumulator, a control valve, and a hydraulic connector. The accumulator connects to a primary hydraulic system including a hydraulic pump, a brake circuit, and a steering circuit. The control valve selectively allows or prevents flow from an accumulator to at least one of the brake circuit and the steering circuit. The hydraulic connector selectively connects an external source to the accumulator and the control valve.

The utility model provides a mining dump truck steering mechanism which comprises a front axle steering assembly and a hydraulic system and further comprises a rear wheel steering assembly arranged on a rear axle, the rear wheel steering assembly comprises a rear steering knuckle and a rear steering driving mechanism, and the rear steering driving mechanism is hinged to the rear steering knuckle. The two ends of the rear axle are connected with the rear knuckle through a steering fork, and a transmission universal shaft in power connection with the rear axle driving shaft and the rear brake drum is arranged in the middle of the steering fork. The rear steering driving mechanism serves as a power source for steering of the rear wheels, the transmission universal shaft penetrating through one end of the steering fork and connected with the rear axle driving shaft through the spline is arranged in the middle of the steering fork, connected with the rear brake drum, of the rear axle, and the steering function is added while transmission is achieved. The rear steering driving mechanism is hinged to the rear steering knuckle, so that steering of the rear wheels is achieved instead of rotation of the rear axle, abrasion of the rear wheels during steering can be greatly reduced, and the service life of tires is prolonged.

The invention discloses a transverse fixed axle assembly capable of achieving Ackerman steering through mechanical linkage, and belongs to the technical field of engineering vehicle chassis. A rear axle is transversely and rigidly fixed to a frame through a shear-resistant box girder structure, and a front axle is connected to the frame through two springs; the rotating pair structures are symmetrically arranged at the two ends of the axle main body and comprise embedded heavy-duty bearings; one end of the steering knuckle arm is hinged to the axle main body through a rotating pair structure, and the other end is connected with the steering pull rod; one end, far away from the rotating pair structure, of the steering pull rod is connected with the steering oil cylinder; the steering pull rod of the front axle and the steering pull rod of the rear axle are crossed and hinged in an X shape, so that intersection points of axes of the front and rear wheels converge at an instantaneous steering center during steering. Abrasion and slipping of tires can be reduced, steering precision is ensured through a pure mechanical structure, the failure risk of an electric control system is avoided, and the system is suitable for heavy equipment such as mining trucks and port cranes.

The invention belongs to the technical field of hydraulic control, and particularly relates to a steering mechanism, a control method of the steering mechanism and an operation machine.The steering mechanism comprises an axle, a steering wheel and a hydraulic control system, and the hydraulic control system comprises a power-assisted steering oil cylinder used for driving the axle to execute steering operation; the oil supply path is used for supplying oil to the power-assisted steering oil cylinder; the electric control reversing valve is arranged on the oil supply way, and two working oil ports of the electric control reversing valve are communicated with a rod cavity and a rodless cavity of the power-assisted steering oil cylinder respectively; the control unit is in communication connection with the electric control reversing valve and is configured to determine the turning angle of an axle under the condition that it is determined that the driver does not place the two hands on a steering wheel; and the working position of the electric control reversing valve is switched according to the turning angle, so that the power-assisted steering oil cylinder drives the axle to return, and the steering wheel is driven to return. By the adoption of the steering mechanism, when the two hands of a driver leave the steering wheel, the power-assisted steering oil cylinder can be automatically controlled to drive the axle and the steering wheel to return.

The utility model discloses a 16-wheel desert drilling machine integral moving and transporting system capable of steering independently, which comprises a plurality of groups of moving and transporting modules uniformly distributed along the periphery of a drilling machine base, each group of moving and transporting modules comprises a gooseneck frame with a heavy frame structure, the front end of each gooseneck frame is hinged with the end part of the drilling machine base through a pin shaft, and the tail end of each gooseneck frame is hinged with an axle system through a pin shaft; the axle system comprises a middle longitudinal beam which is located in the center of the sub-moving module and arranged in the longitudinal direction, the front end and the rear end of the middle longitudinal beam are each provided with a set of axle steering frames, and steering driving columns penetrating through the middle longitudinal beam are connected to the middles of the axle steering frames in a welded mode; the bottoms of the two ends of the axle bogie are connected with the parallel loading axle through hoops and end plates, and rims and tires are assembled at the two ends of the parallel loading axle. By controlling the steering hydraulic cylinder, the included angle of the tires can be adjusted, and then the turning radius of the moving and transporting system can be accurately controlled to adapt to different road condition requirements.

The invention discloses an unmanned mine car front and rear wheel synchronous steering system which comprises a car frame, a front steering axle and a rear steering axle, and the front steering axle and the rear steering axle are installed on a car and control steering through a steering system. The steering system comprises a front axle working cylinder, a front axle driven cylinder, a rear axle working cylinder and a rear axle driven cylinder, the front axle working cylinder and the front axle driven cylinder control front wheels of a vehicle to rotate, the rear axle working cylinder and the rear axle driven cylinder control rear wheels of the vehicle to rotate, and cavities of the front axle working cylinder and the rear axle working cylinder are communicated with a working port A and a working port B of a three-position four-way reversing valve through pipelines respectively. Cavities of the front axle driven cylinder and the rear axle driven cylinder are communicated through a valveless rigid connecting pipeline to form a rigid series oil way, and in the rigid series oil way, the amount of oil discharged by the front wheel working cylinder and the front axle driven cylinder is equal to the amount of oil received by the rear wheel working cylinder and the rear axle driven cylinder. Mechanical hydraulic synchronization of steering angles of front and rear wheels of the vehicle is realized, delay and fault risks of dependence on sensors are eliminated, and high-reliability rigid synchronization is realized.

The utility model discloses a planet multiple steering mechanism which comprises a gearbox body provided with an output shaft, a planet carrier and a planet wheel, an inner gear ring and an outer gear ring are arranged on the outer wall of the gearbox body, and the inner gear ring and the outer gear ring drive the output shaft to rotate and output torque. A first wet clutch bag capable of locking the planet carrier and the output shaft and a second wet clutch bag capable of fixing the planet carrier are arranged in the gearbox body. The rear end of the gearbox body is provided with a lubricating oil port used for injecting oil into the first wet clutch pack and the second wet clutch pack, a first high-pressure oil hole used for injecting oil into the first piston corresponding to the first wet clutch pack and a second high-pressure oil hole used for injecting oil into the second piston corresponding to the second wet clutch pack. The driving method comprises a two-drive mode, a non-multiple four-drive mode and a multiple four-drive mode and can be used for a tractor gearbox and a tractor steering drive axle, front wheel multiple is provided when a tractor steers, and small-radius steering is achieved.

The invention belongs to the technical field of new energy automobile steering systems, and discloses a new energy automobile electric hydraulic power-assisted steering system and a control method thereof.The system integrates a double-source redundant hydraulic power unit, a hydraulic adjusting unit, a multi-dimensional working condition sensing unit and an intelligent main controller; the multi-dimensional working condition sensing unit is integrated with a road adhesion coefficient detection module and a battery remaining capacity detection module. The control method is layered look-ahead matching control and is executed by an intelligent main controller in parallel: a power-assisted decision-making layer divides a three-stage power-assisted mode according to multi-dimensional perception information, and limits a steering angular velocity when power-assisted is enhanced on a low-attached road surface; the energy optimization layer predicts and implements prospective energy storage and pump rotating speed self-adaptive adjustment based on the intention of a driver; and the fault diagnosis layer realizes rapid fault identification and redundancy switching through multi-parameter collaborative diagnosis. The contradiction of high energy consumption, response delay and weak safety guarantee of a traditional system is solved, and power-assisted steering which is safe, energy-saving, fast in response and high in adaptability is achieved.

The invention discloses a four-wheel steering mining dump truck. The four-wheel steering mining dump truck comprises a steering mechanism, a steering hydraulic system, a driving wheel assembly and a frame, the frame is provided with a front axle and a rear axle, the front axle and the rear axle are respectively provided with two driving wheel assemblies, the two driving wheel assemblies of the front axle are connected and mounted on a steering mechanism of the front axle, the two driving wheel assemblies of the rear axle are connected and mounted on a steering mechanism of the rear axle, and a steering wheel of each driving wheel assembly participates in steering; the front axle and the rear axle are respectively provided with an axle support, the frame is provided with a frame support, and the steering mechanism comprises a steering crank, a steering pull rod, a steering arm, a steering cylinder and a steering support; the steering hydraulic system is used for providing pressure oil for the steering cylinder and pushing the telescopic rod to stretch out or retract back. The invention further discloses a steering method of the four-wheel steering mining dump truck. The four-wheel steering electric vehicle has a four-wheel steering function, so that the turning radius of the whole vehicle is smaller, and the vehicle can adapt to a narrower road environment.

The invention relates to a high-voltage and low-voltage dual-motor steering pump driving system for an electric commercial vehicle, belongs to the technical field of vehicle steering control, and is mainly used for solving the safety risk caused by power-assisted steering interruption when a motor of a traditional single-motor driving steering pump breaks down. The system comprises a hydraulic steering pump, a high-voltage motor, a low-voltage motor, a power coupling mechanism, a first clutch, a second clutch, a rotating speed sensor, a temperature sensor and an electronic control unit. The high-voltage motor and the low-voltage motor are selectively connected with an input shaft of the power coupling mechanism through corresponding clutches, and an output shaft of the power coupling mechanism is rigidly connected with a driving shaft of the hydraulic steering pump; the electronic control unit receives sensor data through the signal processing module, and the drive control module is immediately switched to the standby motor and controls the clutch to act. Through the dual-motor redundancy design and the real-time fault switching mechanism, the system is suitable for an electric automobile and a steering system with a high reliability requirement, and the driving safety is remarkably improved.

A hauling vehicle includes a steering circuit having a steering cylinder steered by pressure oil from a hydraulic source, a steering valve that controls the flow of pressure oil to the steering cylinder, and an accumulator that stores pressure oil from the hydraulic source and can supply it to the steering cylinder via the steering valve. The steering circuit is connected to the hydraulic source and the hydraulic fluid tank via a composite control valve. The composite control valve has a first position for communication between the steering circuit and the hydraulic source and blocking communication between the steering circuit and the hydraulic fluid tank, and a second position for communication between the steering circuit and the hydraulic source and communication between the steering circuit and the hydraulic fluid tank. The composite control valve has a throttle in the oil passage that connects the steering circuit in the second position with the hydraulic fluid tank.

The invention discloses a semitrailer rear axle electric control hydraulic steering system based on multi-sensor fusion. The semitrailer rear axle electric control hydraulic steering system comprises a control unit, a sensor system, a motor system and a hydraulic system. The sensor system comprises a vehicle speed sensor, a folding angle sensor and a steering angle sensor; the motor system comprises a motor and a motor controller; the hydraulic system comprises a hydraulic pump, a proportional servo valve and a hydraulic cylinder; during working; the control unit is used for automatically calculating a target steering angle through the vehicle speed information and the folding angle information, comparing the target steering angle with feedback actual steering angle data to obtain an error signal, and outputting a control current of the proportional servo valve according to the error signal; the motor provides power for the hydraulic pump, so that hydraulic oil is provided for the hydraulic cylinder, the opening degree of the proportional servo valve is adjusted under the action of control current, then the flow of the hydraulic cylinder is controlled, and the hydraulic cylinder is used for driving a rear axle of the semitrailer to move, so that the rear axle generates a corresponding steering angle.

This invention proposes a variable speed approach and disturbance compensation control method for a pump-controlled electro-hydraulic steering system. The method uses a variable speed approach terminal sliding mode disturbance observer to accurately estimate the lumped disturbance of the pump-controlled electro-hydraulic servo steering system, and uses an adaptive incomplete compensation method for associated steering angle errors to feedforward compensate for the system's lumped disturbance. The coefficient of this disturbance compensation automatically adjusts according to the error changes, balancing steering accuracy and steering stability. The method includes the following steps: Step S1, establishing a mathematical model of the pump-controlled electro-hydraulic steering system; Step S2, designing a variable speed sliding mode approach law; Step S3, designing a variable speed approach terminal sliding mode disturbance observer; Step S4, designing an incomplete disturbance compensation variable speed approach sliding mode controller; Step S5, designing a Lyapunov stability analysis function for the closed-loop system. This invention achieves high-precision steering control without requiring an accurate model of the pump-controlled electro-hydraulic steering system or an upper bound on the disturbance.

The invention discloses a drive-by-wire hydraulic steering system and method based on linear active disturbance rejection, and belongs to the technical field of automobile steering, the steering system comprises a hydraulic control unit and a control module, the hydraulic control unit is used for controlling the movement direction and the movement speed of a steering oil cylinder by controlling the flowing direction and the flowing speed of hydraulic oil; and the control module is used for calculating the received input turning angle and the actual turning angle according to a linear active-disturbance-rejection steering angle control algorithm, controlling the steering of a steering control valve in the hydraulic control unit, and indirectly controlling the steering angle and the motion trail of the vehicle through the steering of the steering control valve. By means of the steering system and method, the problems of non-linear interference such as uncertainty of tire aligning torque influence factors and electromagnetic coupling of a steering execution motor can be effectively solved, high-precision steering angle tracking control is achieved, the steering precision and the response speed of a vehicle are remarkably improved, and the maneuverability and the sense of safety of a driver are improved.

An unmanned mining truck combining two-way unloading and four-wheel steering comprises a truck frame, a truck hopper, a front duplex unloading hydraulic cylinder, a rear duplex unloading hydraulic cylinder, hydraulic drive type independent steering front wheels, hydraulic drive type independent steering rear wheels, a control room and an automatic driving system. The frame, the front duplex unloading hydraulic cylinder, the car hopper and the rear duplex unloading hydraulic cylinder are matched to form a four-bar mechanism; and environment sensing modules are arranged around the frame. Bidirectional unloading of the truck head and the truck tail is supported, the truck does not need to turn around before entering an unloading station, the truck can directly enter the unloading station, ore raw material unloading can be completed from the direction of the truck tail or the truck head, and the whole unloading process is time-saving and energy-saving; four-wheel steering of front wheels and rear wheels is supported, the turning radius can be effectively reduced, and the steering flexibility under complex road conditions is improved; unmanned driving is supported, unloading operation and steering operation are both completed through an automatic driving system, and the problems of serious fatigue feeling and health of truck drivers caused by manned driving are solved.

An engineering machinery electro-hydraulic steering flexible safety control device and method. The device comprises a first controller (3), an electric control handle (2), an electro-hydraulic steering unit (1), a steering cylinder (5) and an electric control pump (4); the electric control handle (2) is connected to the first controller (3) and sends a steering request signal to the first controller (3), so that the first controller (3) generates a CAN signal or a PWM signal; the electro-hydraulic steering unit (1) comprises an electric control steering module (1.1) and a reversing valve (1.2) which are connected to each other, the electric control steering module (1.1) is further connected to the first controller (3) separately by means of a CAN signal line and a PWM signal line, and the reversing valve (1.2) is further communicated with the steering cylinder (5); the electric control pump (4) is separately connected to the first controller (3) and the reversing valve (1.2); and the electric control steering module (1.1) responds to the CAN signal or the PWM signal sent by the first controller (3), and outputs a pilot pressure on the basis of the CAN signal or the PWM signal to actuate the reversing valve (1.2) to shift. In the device, when a fault has occurred in the CAN signal line, the PWM signal line takes over the steering request signal, thereby guaranteeing that a vehicle continues to steer and achieving the safety of vehicle steering.

The invention provides a self-adaptive carrying and dense parking planning method, system and device and a medium, and belongs to the technical field of intelligent logistics control. The method comprises the steps of detecting a vehicle contour in real time, and obtaining a vehicle width value and an attitude angle; based on the clamping jaw material section inertia moment and the moment safety threshold value, the safety distance is calculated; a quaternion PID controller is used for synchronously adjusting the rotating speed of a steering motor and the stroke of a hydraulic cylinder, and the minimum safety distance is calculated; a parking path is generated by adopting an improved path planning algorithm, and multipath interference is eliminated through waveform matching; and storing the parking space state based on the block chain technology, verifying whether the vehicle is parked in the preset parking space after parking is completed, and updating the global map through the smart contract after verification is passed. Through the modes of dynamic perception, adaptive control, multi-target optimization and credible interaction, the operation precision and stability of the AGV in a carrying scene are realized.

Steering assistance device (200), comprising: first and second input-side steering control modules (221-1, 221-2) controlling an input-side steering motor (231) to enable assistance of an input-side mechanism (110) connected to a steering wheel (140); and first and second output-side steering control modules (222-1, 222-2) that control an output-side steering motor (232) to enable assistance to an output-side mechanism (120) that is mechanically separated from the input-side mechanism (110) and connected to a wheel (150), wherein the first and second input-side steering control modules (221-1, 221-2) and the first and second output-side steering control modules (222-1, 222-2) decide on a role assignment and control a corresponding one of the input-side steering motor (231) and output-side steering motor (232) according to a result of the decision on the role assignment;characterized in that the first and second input-side steering control modules (221-1, 221-2) decide on an input-side role assignment, wherein the first and second input-side steering control modules (221-1, 221-2), if the input-side role assignment succeeds, control the input-side steering motor (231) according to a result of the decision on the input-side role assignment and, if the input-side role assignment fails, control the input-side steering motor (231) according to the result of a decision of the first and second output-side steering control modules (222-1, 222-2) on the input-side role assignment.

A method for steering control includes receiving at least one steering input value, receiving at least one vehicle speed value, and determining, based on the at least one steering input value and the at least one vehicle speed value, a vehicle sideslip angle and a yaw rate. The method also includes generating an initial steering control value based on the vehicle sideslip angle, the yaw rate, and a reference yaw rate value. The method also includes determining a final steering control value based on the initial steering control value and the at least one steering input value, and selectively controlling at least one aspect of a vehicle steering system based on the final steering control value.

The invention provides a vehicle chassis structure, and relates to the technical field of vehicles. The structure comprises a frame, a plurality of axles, a battery assembly, an electric appliance integration assembly, a brake assembly, a steering assembly and a suspension assembly, the plurality of axles comprise a first axle, a second axle, a third axle, a fourth axle and a fifth axle, and the plurality of axles, the battery assembly, the electric appliance integration assembly, a driving assembly, the brake assembly, the steering assembly and the suspension assembly are arranged on the frame; the battery assembly is located between the first shaft and the second shaft, the electric appliance integration assembly is arranged above the first shaft, and the battery assembly is connected with the electric appliance integration assembly; the brake assembly is connected with the multiple axles and used for controlling the multiple axles to brake. The steering assembly is used for controlling the first shaft, the second shaft and the fifth shaft to steer; the suspension assembly is used for controlling the third shaft, the fourth shaft and the fifth shaft to ascend and descend, and the loading performance of the vehicle is improved.

The application belongs to the technical field of golf courses, and discloses a steering mechanism applied to a golf cart, which comprises a mounting cylinder and a mounting sleeve, the inside of the mounting cylinder is movably sleeved with a control shaft, and the outer surface of the control shaft is fixedly sleeved with a gear sleeve. The application is characterized in that the two ends of the arc groove are arranged in a lower-upper mode, one end of the reverse rotation is moved upward and communicated with the corresponding pipeline, the sliding oil in the storage cylinder is extruded by the foot sole stepping and pushing mechanism, the sliding oil enters the control disc under pressure and is communicated into the mounting sleeve along the opposite direction of the steering direction, and the inner shaft in the mounting sleeve is rapidly moved along the moving direction of the rotation direction, so that the power assistance during rotation is realized. When the steering operation is performed on the complex road surface, the hydraulic power assistance is realized by the leg force, the hand control is matched, the actual steering convenience is greatly improved, the steering is labor-saving and reliable, and the actual driving safety is greatly improved.

The invention relates to an electro-hydraulic steering system (100) for a vehicle, in particular a commercial vehicle, comprising: at least one steering gear (102), in particular a spindle steering gear, having at least one steering gear housing (104); at least one first hydraulic assembly (106), in particular an electro-hydraulic assembly, which can be fastened to the steering gear housing (104); and at least one second hydraulic assembly (108), in particular an electro-hydraulic assembly, which can be fastened to the steering gear housing (104), one or more components of the first hydraulic assembly (106) being at least partially integrated in a first housing block (110) and one or more components of the second hydraulic assembly (108) being at least partially integrated in a second housing block (112), or one or more components of the first hydraulic assembly (106) and the second hydraulic assembly (108) are at least partially integrated in a common housing block. The invention also relates to a vehicle, in particular a commercial vehicle, equipped with such a steering system.

The application relates to the technical field of new energy commercial vehicle chassis, and particularly discloses a vehicle with a modular hydrogen fuel cell heavy truck arrangement structure, which comprises a power system, an energy storage module system and a driving system. The power system is arranged with a flattened high-low temperature cooling integrated sub-module, a fuel cell engine and an accessory module, and an air conditioner and waste heat recovery system integrated sub-module. The energy storage system is arranged with a side-hung hydrogen bottle sub-module, a rear hydrogen bottle sub-module, a multi-in-one controller integrated sub-module, a high-voltage accessory integrated sub-module, a low-voltage accessory integrated sub-module and a power battery sub-module. The driving system adopts an electric drive axle module integrated scheme, and the electric drive axle module is integrated with a driving motor, a motor controller, a transmission and a drive axle. The functions and structures of the sub-module systems are highly integrated, and the integrated and lightweight levels are high. The integrated arrangement of the modules is not restricted by market conditions, vehicle types, cab types and the like, and the universality and interchangeability levels of the components are greatly improved.

The invention provides a control method and device of an electro-hydraulic steering gear and a vehicle, and relates to the technical field of steering gear, and the control method comprises the steps that when a driver operates steering, first control is executed; and when the driver does not operate steering and the external interface of the electric power assisting system has the steering requirement, second control is executed. The first control comprises the steps that the electric power system is controlled not to provide electric power in response to the situation that hydraulic power provided by the hydraulic power system does not reach the maximum limit value; determining a current ideal torque corresponding to the current vehicle speed and the current lateral acceleration of the vehicle according to the corresponding relation among the vehicle speed, the lateral acceleration and the ideal torque in response to the situation that the hydraulic assistance reaches the maximum limit value; and according to the difference value between the current input torque and the current ideal torque of the steering wheel, the electric power system is controlled to provide electric power. The second control comprises the steps of controlling the electric power assisting system to provide electric power assisting and controlling the hydraulic power assisting system to provide hydraulic power assisting. The steering comfort can be improved.

A valve (400) for hydraulic parallel work systems (100) is provided. The valve (400) includes a first pair of ports (416, 416a-b), a second pair of ports (422, 422a-b), a first connection, and a second connection. The first connection is between the first pair of ports (416, 416a-b) when the valve (400) is in a load reaction-enabling state (LRQN). The first connection transmits a load reaction (402) from a load at a steering actuator (140) to a steering device of a hydrostatic steering circuit (200). The second connection is between the second pair of ports (422, 422a-b) when the valve (400) is in an electro-hydraulic steering enabling state. The second connection fluidly connects a fluid source (110) to an electro- hydraulic steering circuit (300).

The application discloses a bidirectional driving four-wheel multifunctional hydraulic control method, which comprises a hydraulic control method for controlling driving when a front cab, a hydraulic control method for controlling circle turning when the front cab, a hydraulic control method for controlling driving when a rear cab and a hydraulic control method for controlling circle turning when the rear cab. The switching of multiple oil paths is realized through the opening and closing of a valve group, so that the front axle or the rear axle steering function can be controlled by one cab, and the problem of single steering function is solved. Meanwhile, the position sensor is arranged to realize the automatic identification of the position of a steering oil cylinder and the automatic tire correction centering. In addition, the circle turning function is increased. The hydraulic control method provided by the application can quickly switch the driving mode and simplify the steering operation steps.

The invention belongs to the technical field of forklift hydraulic diagnosis optimization, and provides a fault self-diagnosis and optimization method for a forklift hydraulic system, which is used for monitoring the air pressure of an oil suction pipeline in the forklift hydraulic system, judging whether the oil suction pipeline leaks air or not, directly determining whether a fault occurs at the oil suction pipeline or not, and improving the working efficiency of the forklift hydraulic system. The content of bubbles in oil can be reduced, the pressure and flow transmission efficiency of a hydraulic system can be improved, when it is judged that an oil suction pipeline leaks air, under the scene that the forklift steers at a small angle continuously between narrow goods shelves, the steering lagging duration and the bubble compression duration of each time of small-angle steering are obtained respectively, and the steering lagging duration and the bubble compression duration of each time of small-angle steering are obtained. The correlation degree between the steering lag time and the oil bubble compression time is evaluated, the influence mechanism of air leakage on a steering system is known more deeply, different types of faults can be distinguished, the main reason of steering lag caused by oil bubble compression can be quickly positioned, and the method and the device can be used for adjusting parameters such as the sending opportunity and the frequency of a steering instruction in the later period. And data support is provided.

The utility model belongs to the technical field of land levelers, and discloses a steering structure and a land leveler. The steering structure comprises a bridge frame, two steering knuckles, a double-acting oil cylinder and a sliding connection assembly. The two steering knuckles are rotationally arranged at the two ends of the bridge frame in the first direction; the double-acting oil cylinder comprises a piston rod and an oil cylinder body arranged on the piston rod in a sliding mode, and the piston rod is fixedly arranged on the bridge frame and extends in the first direction. The sliding connection assembly comprises a sliding connection body and two steering pull rods, the sliding connection body is fixedly connected with the oil cylinder body, meanwhile, the sliding connection body is in sliding connection with the bridge frame in the first direction, and the two ends of the sliding connection body in the first direction are hinged to one ends of the two steering pull rods correspondingly; the ends, away from the sliding connecting body, of the two steering pull rods are hinged to the two steering knuckles correspondingly. According to the steering structure, the sliding connector can limit the oil cylinder body to rotate around the axis of the piston rod, abrasion of the double-acting oil cylinder is reduced, and the service life of the double-acting oil cylinder is prolonged.

The invention discloses a hydraulic power steering gear structure and a mounting method thereof, the structure comprises a hydraulic power steering gear, a transmission shaft and a steering tie rod, the hydraulic power steering gear is connected with a steering wheel through the transmission shaft, the hydraulic power steering gear is connected with the steering tie rod through a steering pull arm, and the steering tie rod is connected with a tire. According to the mounting platform with the positioning rod, the technical problems that the steering performance cannot be met and the assembly efficiency is low due to the fact that the initial posture of a steering pull arm does not have standard positioning during mounting of an existing hydraulic power steering gear, the left steering limit angle and the right steering limit angle are inconsistent, the pressure relief function fails, hydraulic locking cannot be achieved, and the steering performance cannot be met can be solved. The invention discloses a method for positioning the initial position of a standardized steering pull arm, which ensures that the steering angle of the steering pull arm is symmetrical and the pressure relief function and the stop function of the hydraulic power steering gear are normal, improves the assembly efficiency and avoids later debugging.